ASME B 18.6.3 (1998)

COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services

The American Society of Mechanical Engineers

A N A M E R I C A N N A T I O N A L S T A N D A R D

MAIHINE SCREWS AND MACHINE

SCREW NUTS

ASME B1 8.6.3-1 MM8 [Revision 01 ANSI B18.6.3-1972(R1997)]


STDmASME BLB.b.3-ENGL L998 m 0759b70 ObL4Lb4 T39 W

Date of Issuance: November 30, 1999

The 1998 edition of this Standard is being issued with an automatic addenda subscription service. The use of an addenda allows revisions made in response to public review comments or committee actions to be published as necessary. The next edition of this Standard is scheduled for publication in 2004.

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This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment, which provides an opportunity for additional public input from industry, academia, regulaton/ agencies, and the public-at-large.

ASME does not "approve," "rate," or "endorse" any item, construction, proprietary device, or activity.

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without the prior written permission of the publisher.

The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990

Copyright O 1999 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

All Rights Reserved Printed in U.S.A.


STDOASME BLB.b.3-ENGL L998 m 0757670 ObL4Lb5 975 m

FOREWORD

American National Standards Committee B 18 for the standardization of bolts, screws, nuts, rivets, and similar fasteners was organized in March 1922, as Sectional Committee B18 under the aegis of the American Engineering Standards Committee (later the American Standards Association, then the United States of America Standards Institute and, as of October 6, 1969, the American National Standards Institute, Inc.), with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors. Subcommittee 3 ' was subsequently established and charged with the responsibility for technical content of standards covering slotted and recessed head screws.

An American Standard setting forth slotted head proportions was approved and published in April of 1930. Over the years following the Issuance of this document, the need for standards more comprehensive than head configurations became apparent. At a meeting held on April 14, 1942, Subcommittee 3' was reorganized and enlarged, and the following operating scope was established:

The scope of Subcommittee 3' shall consist of the development and promulgation of American Standards embracing screw products variously known as machine screws, wood screws, tapping screws, slotted head cap screws, slotted headless set screws, and machine screw nuts. The standards shall comprise complete product standards covering all dimensions and tolerances required for the specification and production of the products. Details shall include boundary dimensions, such as nut width and thickness; screw head dimensions; slot and recess dimensions; body dimensions; thread classification or thread detail, as required; thread length; point design; chamfers; underhead fillets; and supporting general specifications covering the quality, finish, and the acceptable tolerances and limits as well as any information that may be necessrtry to insure satisfactory application of the products.

Several meetings of the Subcommittee over the ensuing 3 years resulted in the development and acceptance of a proposed revision containing complete product standards coverage for slotted and recessed head machine, tapping and wood screws; slotted head and hexagon head cap screws; and slotted headless set screws. Following approval by the B18 Committee and sponsor organizations, this proposal was forwarded to the American Standards Association and declared an American Standard, ASA B 18.6, on April 12, 1947.

Recognizing the need for further refinements, Subcommittee 3' at a meeting held on February I , 1951, established three standing working subgroups: one to develop details pertinent to tapping screw threads; a second to review, revise, and develop head dimensions and tolerances; and a third to correlate and edit the technical information emanating from the other two groups. Also at this meeting, numerous suggested changes were reviewed and assigned to the respective subgroups for further development. Additional meetings of the Subcommittee were held on October 9, 1952, October 29, 1953, and April 1 and 2, 1954. Between each of these meetings the subgroups held numerous working sessions and carried on technical development in cooperation with the technical committees of the U.S. Machine Screw and Tapping Screw Service Bureaus.

' As of April I , 1966, subcommittee 3 was redesignated Subcommittee 6.

... I I I


At the April 1954 meeting, Subcommittee 3,' contemplating a partial revision of the ASA BI 8.6 document, recommended the publication of standards for wood screws, cap and set screws, machine screws, and tapping and drive screws in four separate documents, each of which would consist of a complete product specification. This approach was confirmed by the B I 8 Committee with the further stipulation that the coverage for hexagon head cap screws, square head set screws, and machine screw nuts from the ASA B 18.2 standard be transferred to the documents covering cap and set screws and machine screws, respectively. I t was understood that jurisdiction over the square head set screws and hexagon head cap screws would remain with Subcommittee 2 and that Subcommittee 3' would retain responsibility for machine screw nuts. Following this confirmation and additional direction, the preparation of proposals for the new documents was undertaken.

The proposed standard covering slotted and recessed head machine screws and machine screw nuts was approved by Subcommittee 3' at a meeting held on December 6, 1955. After being circulated to industry for comment, it was revised and subsequently approved by letter ballot of the B 18 Committee in March of 1958. The proposal was, however, redrafted to incorporate additional revisions and refinements adopted by Subcommittee 3' at meetings held on October 30, 1958 and September 17, 1959. The revised proposal was recirculated to the B I 8 Committee and was approved by the sponsor organizations and the American Standards Association and formally designated an American Standard, ASA B 18.6.3, on February 12, 1962.

Following issuance of the 1962 document, Subcommittee 3' and the working subgroups continued to develop revisions and refinements reflecting changes in industry practices and technical improvements. Work over the intervening years culminated in the Subcommittee 6 acceptance of a draft dated November 1969, incorporating revisions in the following areas: inclusion of Type IA cross recess data; addition of the No. o o 0 0 , 000, and O0 sizes to most slotted head styles; extensions of size coverage for 1 0 0 deg flat countersunk heads and binding heads in smaller sizes, and for pan heads in larger sizes; redimensioning of flat and oval countersunk heads; revision of thread lengths; inclusion of appendices for wobble gaging of recessed heads and wrench sizes for square and hex products; and a complete revamping of the format.

In 1997 Subcommittee 6 initiated work to revise the head diameters for flat head screws, the length measurement method for oval head screws, the height inspection for oval head screws, adding protrusion height inspection for oval head screws and quality assurance and designated inspection characteristics. Several drafts were prepared, which resulted in further refinements. These changes were balloted and approved by the ASME BI8 Committee.

This revision was approved as an American National Standard on July 16, 1998.

iv


CORRESPONDENCE WITH THE B18 COMMITTEE

General. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. As such, users of this Standard may interact with the Committee by requesting interpretations, proposing revisions, and attending Committee meetings. Correspondence should be addressed to:

Secretary, B 18 Main Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990

Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically.

The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation.

Interpretations. Upon request, the B 18 Committee will render an interpretation of any requirement of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B I 8 Main Committee.

The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit hisher request in the following format:

Subject: Cite the applicable paragraph number(s) and the topic of the inquiry. Edition: Cite the applicable edition of the Standard for which the interpretation

is being requested. Question: Phrase the question as a request for an interpretation of a specific

requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. The inquirer may also include any plans or drawings, which are necessary to explain the question; however, they should not contain proprietary names or information.

Requests that are not in this format may be rewritten in the appropriate format by the Committce prior to being answered, which may inadvertently change the intent of the original request.

ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available. Further, persons aggrieved by an intcrpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.

Attending Committee Meetings. The B18 Main Committee regularly holds meetings, which are open to the public. Persons wishing to attend any meeting should contact the Secretary of the B 18 Main Committee.

V


ASME B18 STANDARDS COMMITTEE Standardization of Bolts, Nuts, Rivets, Screws,

Washers, and Similar Fasteners

(The following is the roster of the Committee at the time of approval of this Standard.)

OFFICERS

D. A. Clever, Chair R. D. Strong, Vice Chair S. W. Vas , Vice Chair R. L. Crane, Secretary

COMMITTEE PERSONNEL

J. C. Akins, Safety Socket Screw Corp. J. Altman, Rotor Clip Co. J. B. Belford, Lawson Products Inc. D. Broornfield, Illinois Tool Works Inc. J. A. Buda, SPS Technologies D. A. Clever, Deere and Co. A. P. Cockrnan, Ford Motor Co. T. Collier, Cam-Tech Industries Inc. R. L. Crane, The American Society of Mechanical Engineers A. C. DiCola, Wrought Washer Co. A. Dinh, Defense Industrial Supply Center W. D, Downing, Emhart Heli-Coil D. L. Drobnich, Alternate, Ford Motor Co. B. A. Dusina, Federal Screw Works D. S. George, Ford Motor Co. B. Hasiuk, Defense Industrial Supply Center A. Herskovitz, U. S. Army ARDEC A. C. Hood, ACH Technologies J. Hubbard, Rockford Fastener, Inc. F. W. Kern, Consultant W. H. Kopke, ITW Shakeproof Assembly Corp. J. G. Langenstein, Consultant M. Levinson, ITW Shakeproof L. L. Lord, Caterpillar Inc. A. D. McCrindle, Genfast Manufacturing Co. K. E. McCullough, Consultant R. F. Novotny, Camcar Decorah Operations M. D. Prasad, General Motors Corp. W. Schevey, EGM Fastener Co. Inc. J. H. Slass, Alternate, Rotor Clip R. D. Strong, General Motors Corp. J. F. Sullivan, National Fasteners Distribution Association R. L. Tennis, Caterpillar Inc. S. W. Vass, Industrial Fasteners Institute R. G. Weber, Fairfield University School of Engineering C. J. Wilson, Industrial Fasteners Institute

vii Previous page

is blank COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services

SUBCOMMITTEE 6 - SLOTTED AND RECESSED HEAD SCREWS

R. D. Strong, Chair, General Motors Corp. R. L. Crane, Secretary, The American Society of Mechanical Engineers D. Broomfield, Illinois Tool Works Inc. D. A. Clever, Deere and Co. A. Dinh, Defense Industrial Supply Center J. Greenslade, Greenslade and Co. A. Herskovitz, U.S. Army ARDEC M. W. Holubecki, Electric Boat Corp. J. Hubbard, Rockford Fastener, Inc. R. W, Kerr, Kerr Lakeside Inc. R. F. Novotny, Camcar Decorah Operations J. A. Schlink, Caterpillar Inc. J. F. Sullivan, National Fasteners Distribution Association C. B. Wackrow, MNP Corp. C. J. Wilson, Industrial Fasteners Institute

V l l l ...


CONTENTS

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Correspondence With the B 18 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Introductory Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables I A Dimensions of Slotted Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . IB Dimensions of Type I Cross Recessed Flat Countersunk Head Machine

IC Dimensions of Type IA Cross Recessed Flat Countersunk Head Machine

ID Dimensions of Type 11 Cross Recessed Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2A Dimensions of Slotted 100 deg Flat Countersunk Head Machine Screws . . . . . . . . . . 2B Dimensions of Type I Cross Recessed 100 deg Flat Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2C Dimensions of Type I A Cross Recessed 1 0 0 deg Flat Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2D Dimensions of Type II Cross Recessed 100 deg Flat Countersunk Head Machine

3A Dimensions of Slotted Close Tolerance 1 0 0 deg Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3B Dimensions of Type I Cross Recessed Close Tolerance 100 deg Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3C Dimensions of Type I A Cross Recessed Close Tolerance 100 deg Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3D Dimensions of Type II Cross Recessed Close Tolerance 100 deg Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4A Dimensions of Slotted Oval Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . 4B Dimensions of Type I Cross Recessed Oval Countersunk Head Machine

4C Dimensions of Type I A Cross Recessed Oval Countersunk Head Machine

4D Dimensions of Type II Cross Recessed Oval Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5A Dimensions of Slotted Undercut Flat Countersunk Head Machine Screws . . . . . . . . . 5B Dimensions of Type I Cross Recessed Undercut Flat Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C Dimensions of Type I A Cross Recessed Undercut Flat Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standards Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Screws

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

... 111

V

v i i

I

3

7

8

10

I I 12

13

14

15

16

17

18

19 20

22

24

26 28

29

30

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SD

6A 6B

6C

6D

7A

7B

7 c

8A

SB

8C

9A 9B 9 c 9D I 0A I OB I oc 1 OD 1 1 12A 12B 12c I2D 13A 13B 13C 13D 14

15 16 17

Dimensions of Type II Cross Recessed Undercut Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Dimensions of Slotted Undercut Oval Countersunk Head Machine Screws . . . . . . . . 32

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Dimensions of Type I Cross Recessed Undercut Oval Countersunk Head Machine

Dimensions of Type IA Cross Recessed Undercut Oval Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Dimensions of Type II Cross Recessed Undercut Oval Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Dimensions of Type I Cross Recessed Flat Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Dimensions of Type IA Cross Recessed Flat Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Dimensions of Type II Cross Recessed Flat Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Dimensions of Type I Cross Recessed Oval Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Dimensions of Type IA Cross Recessed Oval Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Dimensions of Type II Cross Recessed Oval Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Dimensions of Slotted Pan Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Dimensions of Type I Cross Recessed Pan Head Machine Screws . . . . . . . . . . . . . . . . 49 Dimensions of Type IA Cross Recessed Pan Head Machine Screws . . . . . . . . . . . . . . 50 Dimensions of Type II Cross Recessed Pan Head Machine Screws . . . . . . . . . . . . . . . 51

Dimensions of Type I Cross Recessed Fillister Head Machine Screws . . . . . . . . . . . . 53 Dimensions of Type IA Cross Recessed Fillister Head Machine Screws . . . . . . . . . . 54 Dimensions of Type 11 Cross Recessed Fillister Head Machine Screws . . . . . . . . . . . 56 Dimensions of Slotted Drilled Fillister Head Machine Screws .................... 57 Dimensions of Slotted Truss Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Dimensions of Type I Cross Recessed Truss Head Machine Screws . . . . . . . . . . . . . . 59 Dimensions of Type IA Cross Recessed Truss Head Machine Screws . . . . . . . . . . . . 60 Dimensions of Type II Cross Recessed Truss Head Machine Screws . . . . . . . . . . . . . 61

Dimensions of Type I Cross Recessed Binding Head Machine Screws . . . . . . . . . . . . 63 Dimensions of Type IA Cross Recessed Binding Head Machine Screws . . . . . . . . . . 64 Dimensions of Type II Cross Recessed Binding Head Machine Screws . . . . . . . . . . . 6.5 Dimensions of Plain and Slotted Regular and Large Hex Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Dimensions of Plain and Slotted Hex Washer Head Machine Screws . . . . . . . . . . . . . 68 Dimensions of Square and Hex Machine Screw Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Dimensions of Header Points for Machine Screws Before Threading . . . . . . . . . . . . . 71

Dimensions of Slotted Fillister Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Dimensions of Slotted Binding Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Mandatory Appendices

2 Across-Corners Gaging of' Hex Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

4 Wobble Gaging of Recessed Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS 5 Dimensions for No . 0000, No . 000, and No . 00 Thread Sizes . . . . . . . . . . . . . . . . . . . 89

I Protrusion Gaging of Flat Countersunk Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

3 Penetration Gaging of Recessed Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

x


STDOASME BLB.b.3-ENGL 3798 0759b70 Ob34372 005 m

Nonmandatory Appendices A Formulas for Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 B Wrench Openings for Hex Head Screws and Square and Hex Nuts . . . . . . . . . . . . . . 99 C Dimensions of Round Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

xi


ASME 818.6.3-1998

MACHINE SCREWS AND MACHINE SCREW NUTS

1 INTRODUCTORY NOTES

1.1 Scope

This Standard is intended to cover the complete general and dimensional data for the various types of slotted and recessed head machine screws and machine screw nuts recognized as American National Standard. Also included are appendices that provide specifications and instructions for the protrusion gaging of flat countersunk head screws; across-comers gaging of hex head screws; penetration gaging and wobble gaging of recessed head screws; wrench openings for hex and square products; thread dimensions for the No. 0000, No. 000, and No. O0 sizes; and formulas on which dimensional data are based. It shall be understood, however, that where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula.

The inclusion of dimensional data in this Standard is not intended to imply that all of the products described are stock production sizes. Consumers should consult with manufacturers concerning the availability of products.

1.2 Machine Screw Head Types

The head types covered by this Standard include those commonly recognized as being applicable to machine screws and are enumerated and described in the following paragraphs.

1.2.1 Flat Countersunk Head. The flat countersunk head shall have a flat top surface and a conical bearing surface with a head angle for one style of approximately 82 deg and for another style of approximately 1 0 0 deg. Dimensions are given in Tables IA through ID, and 2A through 2D, respectively. Dimen- sions of close tolerance 100 deg flat countersunk heads are given in Tables 3A through 3D.

1.2.2 Oval Countersunk Head. The oval countersunk head shall have a rounded top surface and a conical bearing surface with a head angle of approximately 82 deg. Dimensions are given in Tables 4A through 4D.

1

1.2.3 Undercut Flat and Oval Countersunk Heads. For short lengths, 82 deg flat and oval countersunk head machine screws shall have heads undercut to 70% of normal side height to afford greater length of thread on the screws. Dimensions are given in Tables 5A through 5D, and 6A through 6D, respectively.

1.2.4 Flat and Oval Countersunk Trim Heads. Flat and oval countersunk trim heads shall be similar to the 82 deg flat and oval countersunk heads except that the size of head for a given size screw is one or two sizes smaller than the regular flat and oval countersunk head size, and oval countersunk trim heads shall have a controlled radius where the curved top surface meets the conical bearing surface. Trim heads are furnished only in cross recessed head types. Dimensions are given in Tables 7A through 7C, and 8A through 8C, respectively.

1.2.5 Pan Head. The slotted pan head shall have a flat top surface rounded into cylindrical sides and a flat bearing surface. The recessed pan head shall have a rounded top surface blending into cylindrical sides and a flat bearing surface. Dimensions are given in Tables 9A through 9D.

1.2.6 Fillister Head. The fillister head shall have a rounded top surface, cylindrical sides, and a flat bearing surface. Dimensions are given in Tables 10A through IOD. Dimensions of drilled fillister head machine screws are given in Table l l .

1.2.7 Truss Head. The truss head shall have a low rounded top surface with a flat bearing surface, the diameter of which for a given screw size shall be larger than the diameter of the corresponding round head. Dimensions are given in Tables 12A through 12D.

1.2.8 Binding Head. The binding head shall have a rounded top surface and slightly tapered sides. The bearing surface shall be flat and, where so specified by purchaser, slotted heads shall have an annular undercut adjacent to the shank. Dimensions are given in Tables 13A through I3D.


STD-ASME BLB-b-3-ENGL 1998

ASME 818.6.3-1998

D 0759b70 Ob14174


1.2.9 Hex Head. The hex head shall have a flat 1.7 Terminology or indented top surface, six flat sides, and a flat bearing surface. Dimensions for regular and large heads are given in Table 14.

For definitions of terms relating to fasteners or fea- tures thereof used in this Standard, refer to ASME B 18.12, Glossary of Terms for Mechanical Fasteners.

1.2.10 Hex Washer Head. The hex washer head shall have an indented top surface and six flat sides 1-8 Related Standards formed integrally with a flat washer that projects beyond It should be noted that standards for cap screws, set the sides and provides a flat bearing surface. Dimensions screws, tapping screws, wood screws, drive screws, are given in Table 15. sems, washers, and other related fasteners are published

under separate cover as listed at the end of this Standard. 1.2.11 Round Head. The round head shall have

a semielliptical top surface and a flat bearing surface. In recognition of superior slot driving characteristics 1.9 Comparison With IS0

of pan head screws over round head screws, and the This Standard has no IS0 counterpart. overlap in the dimensions of cross recessed pan heads and round heads, it is recommended that pan head screws be used in new designs and wherever possible l. 1 O References

substituted in existing designs. To expedite elimination The following is a list of publications referenced in of the necessity for perpetuating stocks of finished this Standard. products and tooling, it should be recognized that during the transition period manufacturers may, when it is ASME B 1.1, Unified Inch Screw Threads (UN and agreeable to users, substitute pan head where round head is specified. Dimensions are given for reference ASME B18.12, Of Tenns for purposes in Appendix C.

UNR Thread Form)

Fasteners

for General Purpose Fasteners

for High-Volume Machine Assembly Fasteners

ASME B 18.18. IM, Inspection and Quality Assurance

1.3 Machine Screw Nuts ASME B 18.18.2M, Inspection and Quality Assurance

The machine screw nuts covered by this Standard ASME B 18.24.1, Part Identifying Number (Pin) Code include the hexagon and square varieties. Dimensions System Standard for B 18 Externally Threaded are given in Table 16. Products

ASME B18.24.2, Part Identifying Number (Pin) Code System Standard for B18 Internally Threaded Products

All dimensions i n this Standard are given in inches, publisher: The ~~~~i~~~ Society of Mechanical Engi- unless stated otherwise. neers (ASME International), Three Park Avenue,

New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300.

Unless otherwise specified at the time the order is Options7 where 'Pecified7 be at the placed, the latest level of all reference standards shall

of the manufacturer unless otherwise agreed upon by be used. the manufacturer and the purchaser. ANSI and IS0 standards may be obtained from

ANSI, the American National Standards Institute, 1 I

1.4 Dimensions

1.5 Options

1.6 Responsibility for Modification West 42nd Street, New York, NY 10036-8002. ASTM standards may be obtained from the American

The manufacturer shall not be held responsible for Society for Testing and Materials, 100 Barr Harbor malfunctions of product determined to be due to plating Drive, West Conshohocken, PA 19428-2959. or other modifications when such plating or modification SAE standards may be obtained from the Society of is not accomplished under the manufacturer's control Automotive Engineers, Inc. 400 Commonwealth Drive, or direction. Warrendale, PA 15096-OO01.

2


MACHINE SCREWS ANO MACHINE SCREW NUTS

1.11 Inspection and Quality Assurance

Unless otherwise specified, acceptability to this Stan- dard shall be determined i n accordance with ASME B 18.18. I M, Inspection and Quality Assurance for Gen- eral Purpose Fasteners.

When applicable, the following designated characteristics shall be inspected to the inspection levels shown according to ASME B 18.1 8.2M, Inspection and Quality Assurance for High-Volume Machine Assembly Fasten- ers, and shall be within their specified limits.

Designated Characteristic Inspection Level

Recess penetration depth C Slot depth C Width across corncrs C Thread acceptance C Tensile strength test C Nut proof load test C

If verifiable in-process inspection is used, inspection sample sizes and reporting shall be in accordance with the applicable ASME, ASTM, or SAE quality system consensus standard.

For nondesignated dimensional characteristics, the provisions of ASME B 18.18. IM shall apply. Should a nondesignated dimension be determined to be outside its specified limits, it shall be deemed conforming to this Standard if the user who is the installer accepts the dimension, based upon form, fit, and function considerations.

2 GENERAL DATA

2.1 Heads

2.1.1 Head Height. All dimensions pertaining to head height specified in the dimensional tables shall be measured parallel to the axis of screw and those relating to the top of head shall represent a metal-to- metal measurement. In other words, any truncation of rounded head contours due to the slot or recess shall not be considered part of the head height.

Total or overall head heights shall be measured from the top of the head to the plane of the bearing surface for flat bearing surface type heads, to the plane of the undercut for undercut countersunk heads, and to the junction of the conical bearing surface with the basic screw diameter for countersunk heads.

Head side heights shall be measured from the theoretical intersection of the top surface of head with the head diameter to the plane of the bearing surface for flat bearing surface type heads, to the plane of the

ASME 818.6.3-1998

undercut for undercut countersunk heads, and to the junction of the conical bearing surface with the basic screw diameter for countersunk heads.

On countersunk heads, the junction of the conical bearing surface with the basic screw diameter may not necessarily be the same as the actual junction of head with shank and the head height delineating the conical bearing surface is a reference dimension.

2.1.2 Bearing Surface. The bearing surface of flat bearing surface type machine screw heads shall be perpendicular to the axis of the screw shanks within 2 deg.

2.1.3 Depth of Recess. The depth of recess in recessed head screws shall be measured, parallel to the axis of screw, from the intersection of the maximum diameter of the recess with the head surface to the bottom of the recess.

Recess penetration gaging depth values are included in the respective dimensional tables, and the method of gaging and specifications for gages are contained in Appendix III .

Recess wobble gages, gaging procedures, and permissible limits are given in Appendix IV.

2.1.4 Depth of Slot. The depth of slot in slotted head screws shall be measured, parallel to the axis of screw, from the top of the head to the intersection of the bottom of the slot with the head surface or bearing surface.

2.1.5 Feature Positional Tolerances. The positional relationship of the heads and driving provisions of screws with respect to the shanks of screws (formerly defined as eccentricity) shall be as follows.

(a) True Position of Head. The axis of the head shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 6% of the specified maximum head diameter, or maximum width across flats of hex and hex washer heads, regardless of feature size.

(b) True Position of Recess. The recess in cross recessed head screws shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 12% of the basic screw diameter or 0.030 in., whichever is greater, regardless of feature size.

3


STDOASME BLB.b.3-ENGL

ASME B18.6.3-1998

(c) True Position of Slot. The slot in slotted head screws shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 12% of the basic screw diameter or 0.020 in. , whichever is greater.

2.1.6 Underhead Fillets. Machine screws shall have a definite underhead fillet large enough to ensure that full fastener strength is achieved. The radius of the fillct under countersunk head screws shall be no greater than 40% of the basic screw diameter. The radius of the fillet under truss heads and number 6 sized pan heads shall be no greater than 25% of the basic screw diameter. The radius of the fillet under all other head styles shall be no greater than 15% of the basic screw diameter.

2.2 Length

2.2.1 Measurement. The nominal length of screw L shall be measured, parallel to the axis of screw, from the extreme point to the plane of the bearing surface for screws having perpendicular bearing surface type heads, and to the theoretical intersection of the top surface of head with the head diameter for screws having countersunk type heads. For all oval heads, the overall length L, shall be measured, parallel to the axis of the screw, from the extreme point to the top of the head, where

L , = L + c

L998


sizes, which are covered in Appendix V, shall be Unified Standard, Class 2A, UNC and UNF series, or UNRC and UNRF series, at option of manufacturer, in accordance with ASME B I . l . For threads with additive finish, the maximum diameters of Class 2A may be exceeded by the amount of the allowance: that is, the Class 2A maximum diameters shall apply to an unplated or uncoated part, or to a part before plating or coating, whereas the basic diameters (Class 3A GO) shall apply to a part after plating or coating. The minimum major diameter of plated or coated screws may approach but shall not be less than the Class 2A minimum limit.

2.3.2 Machine Screw Nuts. Threads shall be Unified Standard, Class 2B, UNC or UNF series for hexagon machine screw nuts, and UNC series for square machine screw nuts, in accordance with ASME B 1 . l .

2.4 Length of Thread

2.4.1 Machine Screws. Machine screws shall have thread lengths conforming to the following (on screws threaded full length, the distance to first full form thread shall be measured, parallel to the axis of screw, from the bearing surface of the head to the face of a nonchamfered or noncounterbored standard 3A GO thread ring gage assembled by hand as far as the thread will permit).

2.2.2 Tolerance on Length. The length tolerance shall apply to L , for all oval heads and to L for all other head styles. The tolerance on the length of machine screws shall conform to the following for the respective screw types:

( a ) Sizes No. 5 and Smaller. Screws of nominal lengths equal to three diameters and shorter shall have full form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including IV8 in., shall have fu l l form threads

Tolerance on Length extending to within two pitches (threads) of the bearing for Nominal Screw Size

Nominal m 0 94

Screw Through Through Through Lengrh O0 12 v4

up to '/z in., incl. -0.0 I -0.02 -0.03 Over '12 IO I in., inci. -0.02 -0.03 -0.03 Over I to 2 in.. incl. . . . -0.06 -0.06 Over 2 in. . . . -0.09 -0.09

2.3 Threads

2.3.1 Machine Screws. The threads on machine screws, except for the No. 0000, No. 000, and No. 00

surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full form thread of I in.

(b) Sizes No. 6 and Larger. Screws of nominal lengths equal to three diameters and shorter shall have full form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have ful l form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of ful l form thread of 1.50 in.

4



2.5 Points

Unless otherwise specified, machine screws shall have plain sheared ends. Where so specified, header points shall be as shown in Table 17. Other points or pointing of longer lengths to header point dimensions may require machining.

2.6 Diameter of Body

2.6.1 Machine Screws. The diameter of body on machine screws having other than trim heads shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread.

2.6.2 Trim Head Machine Screws. The diameter of body on trim head machine screws shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread. Screws not threaded to the head shall have a 0.062 in. minimum length shoulder under the head with diameter limits as specified in the dimensional tables.

2.7 Material

2.7.1 Machine Screws. Unless otherwise specified, machine screws shall be fabricated From carbon steel and shall have a minimum tensile strength of 60,000 psi.

Machine screws. where so specified, may also be made from higher strength steels, corrosion resistant steel, brass, monel, aluminum alloys, or other materials, as agreed upon between the manufacturer and the purchaser.

2.7.2 Machine Screw Nuts. Machine screw nuts are normally supplied in steel, corrosion resistant steel, or brass as specified by the purchaser. Unless otherwise specified, no physical requirements shall apply.

2.8 Finish

Unless otherwise specified, machine screws and machine screw nuts shall be supplied with a natural (as processed) finish, unplated or uncoated.

ASME 618.6.3-1998

2.9 Workmanship

Machine screws and machine screw nuts shall not contain an excess of surface imperfections that might affect their serviceability, such as, burrs, seams, laps, loose scale, and other irregularities.

2.10 Designation

2.10.1 Machine Screws. Machine screws shall be designated by the following data in the sequence shown: nominal size (number, fraction, or decimal equivalent); threads per inch; nominal length (fraction or decimal equivalent); product name, including head type and driving provision; header point, if desired; material; protective finish, i f required; or, optionally, ASME B1 8.24. I PIN code. For example:

EXAMPLE I : 1/4 - 20 x 1-1/4 Slotted Pan Head Machine Scrcw. Steel, Zinc Plated

" i'

I

530N A99 C A ""

.D19 155NN CE + 4 + "-

1~" Plating, coating, and passiv- ation: electrodeposited coatings of zinc on irnn and steel, type I I , SC 1

L Material and treatment: equivalent to PIN 001 through 15.3

-Diameter and length: 0.250 and 1.250

L T h r e a d series: thread forming. thread cut- ting, and metallic drive

1 1 ._ Head and drive: screws, machine, pan head,

i B I8 standard designation: B 18.6.3 slvtted

- Fastener family: screw

EXAMPLE 2: 16 - 32 x 3/1 Type IA Cross Recessed Filli\kr Head Machine Screw, Brasa

S 630N A60 C A614 603NN AA

Unplated, uncoated IL UNS 46200

__ 0.138 and 0.750

Screws, machine, fillister head, type I A cross recess

818.6.3 - Screw

5


ASME 818.6.3-1998

EXAMPLE 3: 3 7 5 - 16 x 1.50 Hexagon Washer Head Machine Screw. Header Poinled, Steel

S 630N AX1 C AK21 l55NN AA 4 A A 4 r 4

~

Unplated, uncoated i ~~ Equivalent to PIN 001 through 153

0.375 and 1.500

L UNC ~ ~ Screws, machine, hex washer head, unslotted

818.6.3 ~ Screw

EXAMPLE 1: . I O 0 - 24 x 1 S O Type II Cross Recessed Flat Count- ersunk Head Machine Screw. Steel. Nickel Plated

"" S 630N A65 C AA21 302NN RA I

I Special feature: none Nickel plating, class I, grade E

to PIN 217, 224, 274, or 275

I , L Screws, machine, Rat head, type II cross recess I L ßlX.6.3 L- Screw

I !

2.10.2 Machine Screw Nuts. Machine screw nuts shall be designated by the following data i n the sequence shown: nominal size (number, fraction, or decimal


equivalent); threads per inch; product name; material; protective finish, if required; or, optionally, ASME B18.24.2 PIN code. For example:

EXAMPLE I : 10 - 2 1 Hexagon Machine Screw Nut, Steel, Zinc Plated

N 630N I5 C AAN __ . N 155NNN CE 1 ""

Special feature: none Plating, coating, and passiv- ation: electrodeposited coatings of zinc on iron and steel, type II, SC 1

Material and treatment: equivalent to PIN O01 through 153

- Diameter (for nuts or inserts) and length (for inserts): 0.190, size 10

-Thread series: UNC -Fastner type: machine screw nuts, hex (inch)

- BIS Standard Designation: BlS.6.3 - Fastener Family: Nut

EXAMPLE 2: ,138 - 3 2 Square Machine Screw Nut, Brass

630N -

i I4 C A6NN 603NNN AA 1 A 1 L Special feature: none

i Machine screw nuts, square (inch) B18.6.3

- Nut

6


MACHINE SCREWS AND MACHINE SCREW NUTS ASME B18.6.3-1998

Edge of head may be A min. rounded or flat

L G - 4 L Protrusion gage

TABLE 1A DIMENSIONS OF SLOTTED FLAT COUNTERSUNK HEAD MACHINE SCREWS

Nominal Size Head

L H. Ref. Diameter G

Protrusion Above Slot Depth Gaging Diameter or Basic Screw Length Head Diameter Height 'lot Width

Gaging Diameter

A J T F [Note 1411

[Note (111 [Note (211 Max. Min. [Note (311 Max. Min. Max. Min. Max. Min. [Note (411

O000 0.0210 O00 0.0340 O0 0.0470

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

1/4 0.2500 0.3125 0.3750

'/16 0.4375

v2 0.5000 0.5625

"/B 0.6250 3/, 0.7500

. . . 0.040

. . . 0.060

. . . 0.087

l/8 0.112 '/a 0.137 '/a 0.162 'h 0.187

3/16 0.212 3/16 0.237 % 6 0.262

l/4 0.312 5/,6 0.362 '18 0.412

'h 0.597 '4 0.717 "8 0.760

9 4 0.815

'/16 0.477

. . . 0.932

. . . 1 .O50

. . . 1.285

0.035 0.055 0.080

0.096 0.120 0.144 0.167

0.191 0.215 0.238

0.285 0.333 0.380

0.442 0.556 0.670 0.715

0.765 0.878 0.990 1.215

0.01 1 0.008 0.016 0.011 0.028 0.017

0.035 0.023 0.043 0.026 0.051 0.031 0.059 0.035

0.067 0.039 0.075 0.043 0.083 0.048

0.100 0.054 0.116 0.060 0.132 0.067

0.153 0.075 0.191 0.084 0.230 0.094 0.223 0.094

0.223 0.106 0.260 0.118 0.298 0.133 0.372 0.149

0.004 0.007 0.010

0.016 0.019 0.023 0.027

0.031 0.035 0.039

0.045 0.050 0.056

0.064 0.072 0.081 0.081

0.091 0.102 0.116 0.131

0.007 0.009 0.014

0.015 0.019 0.023 0.027

0.030 0.034 0.038

0.045 0.053 0.060

0.070 0.088 0.106 O. 103

0.103 0.120 O. 137 0.171

0.003 0.005 0.009

0.010 0.012 0.015 0.017

0.020 0.022 0.024

0.029 0.034 0.039

0.046 0.058 0.070 0.066

0.065 0.077 0.088 0.111

Note (5) Note (51 Note (51

0.026 0.028 0.029 0.031

0.032 0.034 0.036

0.039 0.042 0.045

0.050 0.057 0.065 0.073

0.081 0.089 0.097 0.112

Note (5) Note (5) Note (51

0.016 0.016 0.077 0.018

0.019 0.020 0.021

0.023 0.025 0.027

0.029 0.034 0.039 0.044

0.049 0.053 0.058 0.067

Note (51 Note (5) Note (5)

0.078 0.101 0.124 0.148

0.172 0.196 0.220

0.267 0.313 0.362

0.424 0.539 0.653 0.690

0.739 0.851 0.962 1.186

GENERAL NOTE: For additional requirements refer to para. 2.

NOTES: (11 Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall b e omitted. (2) Screws of these lengths and shorter shall have undercut heads as shown in Table 5A. (31 Tabulated values determined from formula for maximum H in Appendix A. (41 No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected

(5) Not practical to gage. accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I.


ciw

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TABL

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D

IMEN

SIO

NS

OF

TYPE

I

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R

ECES

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FL

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mina

l Siz

e

or

Basic

Sc

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Diam

eter

Leng

th 1

Head

Diam

eter A

Head

He

ight

Ii,

Ref.

Rece

ss

Protr

usion

Ab

ove

Pene

tratio

n Ga

ging

Diam

eter

Gagin

g F

Rece

ss

Rece

ss

Rece

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Diam

eter

6 Di

amete

r De

pth

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iver

Gagin

g De

pth

F [N

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G

7

[Not

e (1

11

[Not

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iH

Max

. M

in.

[Not

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11

M.

Ref.

T, R

ef.

N,

Ref.

Size

Max

. M

in.

Max

. M

in.

[Not

e (4

11

g

0 0.

0600

1

0.07

30

2 0.

0860

3

0.09

90

4 0.

1120

5

0.12

50

6 0.

1380

8 0.

1640

10

0.19

00

12

0.21

60

v3

‘/4

0.25

00

‘&

0.31

25

“/s

0.37

50

?&

0.43

75

‘I*

0.50

00

?‘,5

0.

5625

“/8

0.

6250

“/a

0.

7500

‘43

0.112

'A

0.13

7 ‘/s

0.

162

‘/8

0.18

7

%a

0.21

2 %

6 0.

237

%I3

0.

262

‘4

0.31

2 5/

6 0.

362

%I

0.41

2

‘/16

0.47

7 ‘4

0.

597

%a

0.71

7 %

0.

760

3/,

0.81

5 .

. 0.

932

. 1.

050

. 1.

285

0.096

0.

035

0.06

2 0.

035

0.01

4 0

0.03

6 0.

020

0.02

6 0.

016

0.12

0 0.

043

0.07

0 0.

043

0.01

5 0

0.04

4 0.

028

0.02

8 0.

016

0.14

4 0.

051

0.09

6 0.

055

0.01

7 1

0.05

6 0.

040

0.02

9 0.

017

0.16

7 0.

059

0.10

0 0.

060

0.01

8 1

0.06

1 0.

045

0.03

1 0.

018

0.191

0.

067

0.12

2 0.

081

0.01

8 1

0.08

2 0.

066

0.03

2 0.

019

0.21

5 0.

075

0.14

8 0.

074

0.02

7 2

0.07

5 0.

052

0.03

4 0.

020

0.23

8 0.

083

0.16

8 0.

094

0.02

9 2

0.09

5 0.

072

0.03

6 0.

021

0.28

5 0.

100

0.18

2 0.

110

0.03

0 2

0.11

0 0.

087

0.039

0.

023

0.26

7

0.33

3 0.

116

0.19

8 0.

124

0.03

2 2

0.12

5 0.

102

0.04

2 0.

025

0.31

3

0.38

0 0.

132

0.26

2 0.

144

0.03

5 3

0.13

9 0.

116

0.04

5 0.

027

0.36

2

0.44

2 0.

153

0.27

6 0.

160

0.03

6 3

0.15

4 0.

131

0.05

0 0.

029

0.42

4 0.

556

0.19

1 0.

358

0.20

5 0.

061

4 0.

196

0.17

4 0.

057

0.03

4 0.

539

0.67

0 0.

230

0.38

6 0.

234

0.06

5 4

0.22

5 0.

203

0.06

5 0.

039

0.65

3

0.71

5 0.

223

0.40

2 0.

250

0.06

8 4

0.24

1 0.

219

0.07

3 0.

044

0.69

0

0.76

5 0.

223

0.41

8 0.

265

0.06

9 4

0.25

6 0.

234

0.08

1 0.

049

0.739

0.87

8 0.

260

0.44

3 0.

289

0.07

3 4

0.28

0 0.

258

0.08

9 0.

053

0.85

1

0.99

0 0.

298

0.56

5 0.

329

0.07

9 5

0.30

9 0.

283

0.09

7 0.

058

0.96

2

1.21

5 0.

372

0.62

8 0.

393

0.08

7 5

0.37

3 0.

347

0.11

2 0.

067

1.18

6

0.07

8 z z

0.10

1 m

0.12

4 0.

148

8 z

0.17

2 0.

196

c=

0.22

0 o,

GEN

ERAL

NO

TES:

(a

) Fo

r ad

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nal

requ

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ents

refe

r to

pa

ra.

2.

(b)

For

refe

renc

e,

see

Tabl

e IB

Illu

stra

tion

on

prev

ious

page

.

NOTE

S:

(1)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

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de

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pl

ace

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l be

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itted

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) Sc

rews

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th

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ve

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ads

as

show

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Ta

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58.

(3)

Tabu

late

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Ap

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ix A.

(4

) No

to

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nce

for

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diam

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If th

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of

the

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rs

from

ta

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ted

value

, th

e pr

otru

sion

will

be

affe

cted

ac

cord

ingl

y an

d th

e R

prop

er

prot

rusio

n va

lues

m

ust

be

reca

lcula

ted

usin

g th

e fo

rmul

as

show

n in

Ap

pend

ix I.

2 a ZiJ

b ;


,-Edg

e of

he

ad

may

be

This

ty

pe

of r

wcs9

hn

s il

Iarg

c cc

n1cr

op

ening

. wi

de

stra

ighr

w

mgs

. an

d blu

nt

botto

m.

vrilh

all

ed

ges

relie

ved

or

roun

ded.

TABL

E IC

D

IMEN

SIO

NS

OF

TYPE

IA

CR

OSS

R

ECES

SED

FL

AT

CO

UN

TER

SUN

K H

EAD

M

ACH

INE

SCR

EWS

Nom

inal

Si

ze

or

Basi

c Sc

rew

Diam

eter

[Not

e (V

I

Leng

th

[Not

: (2

)I

Head

Di

amet

er

A

Max

. M

in.

Head

He

ight

If,

Re

f.

[Not

e W

I

Rece

ss

Rece

ss

Diam

eter

De

pth

M.

Ref.

T,

Ref.

Rece

ss

Wid

th

N,

Ref.

Drive

r Si

ze

Rece

ss

Pene

tratio

n G

aging

De

pth

Max

. M

in.

Prot

rusio

n Ab

ove

Gag

ing

Gag

ing

Diam

eter

Di

amet

er

F [N

ote

(411

G

Max

. M

in.

[Not

e (4

11

0 0.

0600

1

0.07

30

2 0.

0860

3

0.09

90

0.11

2 0.

096

0.03

5 0.

062

0.03

6 0.

018

0.13

7 0.

120

0.04

3 0.

070

0.04

4 0.

018

0.16

2 0.

144

0.05

1 0.

096

0.05

5 0.

029

0.18

7 0.

167

0.05

9 0.

100

0.06

0 0.

029

0.03

7 0.

021

0.02

6 0.

016

0.07

8 0.

045

0.02

9 0.

028

0.01

6 0.

101

0.05

3 0.

037

0.02

9 0.

017

0.12

4 0.

058

0.04

2 0.

031

0.01

8 0.

148

4 0.

1120

5 0.

1250

6

0.13

80

0.21

2 0.

191

0.06

7 0.

122

0.08

1 0.

030

1 0.

079

0.06

3 0.

032

0.01

9 0.

172

0.23

7 0.

215

0.07

5 0.

148

0.07

7 0.

041

2 0.

071

0.05

3 0.

034

0.02

0 0.

196

0.26

2 0.

238

0.08

3 0.

168

0.09

8 0.

041

2 0.

091

0.07

3 0.

036

0.02

1 0.

220

8 0.

1640

IO

0.

1900

12

0.

2160

0.31

2 0.

285

0.100

0.

182

0.11

2 0.

041

2 0.

107

0.08

9 0.

039

0.02

3 0.

362

0.33

3 0.

116

0.19

8 0.

127

0.04

1 2

0.12

2 0.

104

0.04

2 0.

025

0.41

2 0.

380

0.13

2 0.

262

0.14

9 0.

056

3 0.

136

0.11

8 0.

045

0.02

7

0.26

7 0.

313

0.36

2 5 1

0.42

4 F

0.53

9 Ill

1/

, 0.

2500

5/

6 0.

3125

"18

0.37

50

)/16

0.43

75

0.47

7 0.

442

0.15

3 0.

276

0.16

4 0.

057

0.59

7 0.

556

0.19

1 0.

358

0.21

1 0.

086

0.71

7 0.

670

0.23

0 0.

386

0.23

9 0.

086

0.76

0 0.

715

0.22

3 0.

402

0.25

6 0.

086

0.15

1 0.

133

0.05

0 0.

029

0.19

3 0.

175

0.05

7 0.

034

0.22

2 0.

204

0.06

5 0.

039

0.23

8 0.

220

0.07

3 0.

044

0.65

3 8

0.69

0 g

0.73

9 5

0.85

1 0.

962

2

1.18

6 $

72

0.50

00

%6

0.56

25

5/8

0.62

50

"/4

0.75

00

0.81

5 0.

765

0.22

3 0.

418

0.27

1 0.

086

0.93

2 0.

878

0.26

0 0.

440

0.29

4 0.

087

1.05

0 0.

990

0.29

8 0.

566

0.33

4 0.

098

1.28

5 1.

215

0.37

2 0.

630

0.40

0 0.

099

0.25

3 0.

235

0.08

1 0.

049

0.27

6 0.

258

0.08

9 0.

053

0.30

7 0.

286

0.09

7 0.

058

0.37

2 0.

351

0.11

2 0.

067

GEN

ERAL

NO

TE:

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

NOTE

S:

El

(I)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

. (2

) Sc

rews

of

th

ese

leng

ths

and

shor

ter

shal

l ha

ve

unde

rcut

he

ads

as

show

n in

Ta

ble

5C.

w

(3)

Tabu

late

d va

lues

de

term

ined

from

fo

rmula

fo

r m

axim

um

H in

Ap

pend

ix A.

?i

(4)

No

tole

ranc

e fo

r ga

ging

dia

met

er

is

given

. If

the

gagi

ng

diam

eter

of

th

e ga

ge

used

di

ffers

fro

m

tabu

late

d va

lue,

the

prot

rusio

n w

ill be

af

fect

ed

acco

rdin

gly

and

the

z

prop

er

prot

rusio

n va

lues

m

ust

be

reca

lcula

ted

usin

g th

e fo

rmul

as

show

n in

Ap

pend

ix I.

z d


TABL

E ID

D

IMEN

SIO

NS

OF

TYPE

II

CR

OSS

R

ECES

SED

FL

AT

CO

UN

TER

SUN

K H

EAD

M

ACH

INE

SCR

EWS

5 Pr

otrus

ion

Abov

e 2

Nom

inal

Size

Head

He

ad

Gagin

g 2

or

Basic

Sc

rew

Leng

th Di

amete

r He

ight

Rece

ss

Rece

ss

Rece

ss

Drive

r Re

cess

Pe

netra

tion

Gagin

g Di

amete

r Di

amete

r m

Diam

eter

1 A

H,

Ref.

Diam

eter

Depth

W

idth

Size

Gagin

g De

pth

F [N

ote

(511

G

t?

[Note

(Il

l [N

ote

WI

Max

. M

in.

[Note

(3

11

M,

Ref.

T, R

ef.

N,

Ref.

[Note

(4

11

Max

. M

in.

Max

. M

in.

[Note

(5

11

$

0 0.0

600

1 0.0

730

2 0.0

860

3 0.0

990

4 0.1

120

5 0.1

250

6 0.1

380

8 0.1

640

10

0.190

0

12

0.216

0

‘/4

0.250

0

5/16

0.312

5

“/8

0.375

0

‘/,c

0.437

5

5;

0.500

0

9/6

0.562

5

5/8

0.625

0

“/a

0.750

0

‘1s

0.112

0.0

96

0.035

0.0

78

0.036

‘h

0.137

0.1

20

0.043

0.0

92

0.048

‘1.

0.1

62

0.144

0.0

51

0.114

0.0

60

‘h 0.1

87

0.167

0.0

59

0.133

0.0

72

346

0.212

0.1

91

0.067

0.1

51

0.082

3A

6 0.2

37

0.215

0.0

75

0.169

0.0

94

3/16

0.262

0.2

38

0.083

0.1

88

0.106

‘h 0.3

12

0.285

0.1

00

0.224

0.1

24

5/16

0.362

0.3

33

0.116

0.2

60

0.148

“6

0.4

12

0.380

0.1

32

0.297

0.1

72

‘46

0.477

0.4

42

0.153

0.3

44

0.195

%

0.597

0.5

56

0.191

0.4

32

0.252

g/6

0.717

0.6

70

0.230

0.5

09

0.302

%

0.7

60

0.715

0.2

23

0.554

0.3

32

“4

0.815

0.7

65

0.223

0.5

93

0.358

. 0.9

32

0.878

0.2

60

0.640

0.3

87

1.050

0.9

90

0.298

0.6

40

0.387

1.285

1.2

15

0.372

0.6

40

0.387

0.021

No

te (6

) No

te (6

)

0.024

No

te (6

) No

te (6

)

0.027

0.0

40

0.029

0.030

0.0

53

0.041

0.032

0.0

64

0.052

0.0

32

0.019

0.1

72

0.035

0.0

77

0.064

0.0

34

0.020

0.1

96

0.038

0.0

89

0.075

0.0

36

0.021

0.2

20

0.043

0.1

13

0.099

0.0

39

0.023

0.2

67

0.048

0.1

37

0.122

0.0

42

0.025

0.3

13

0.054

.

0.162

0.1

45

0.045

0.0

27

0.362

0.061

0.1

93

0.176

0.0

50

0.029

0.4

24

0.074

0.2

51

0.232

0.0

57

0.034

0.5

39

0.086

0.3

03

0.281

0.0

65

0.039

0.6

53

0.092

0.3

32

0.310

0.0

73

0.044

0.6

90

0.098

0.3

59

0.335

0.0

81

0.049

0.7

39

0.104

0.3

89

0.364

0.0

89

0.053

0.8

51

0.104

0.3

89

0.364

0.0

97

0.058

0.9

62

0.104

0.3

89

0.364

0.1

12

0.067

1.1

86

- 0.0

26

0.016

0.0

78

0.028

0.0

16

0.101

-5

0.029

0.0

17

0.124

2

0.031

0.0

18

0.148

GENE

RAL

NOTE

: Fo

r ad

dition

al re

quire

men

ts re

fer

to

para

. 2

NOTE

S:

(1)

Whe

re sp

ecify

ing

nom

inal

size

in de

cimals

, ze

ros

prece

ding

decim

al an

d in

the

fourth

de

cimal

place

sh

all

be

omitte

d.

iz

(2)

Scre

ws

of

these

len

gths

and

shor

ter

shall

ha

ve

unde

rcut

head

s as

sh

own

in Ta

ble

50.

5

(3)

Tabu

lated

va

lues

deter

mine

d fro

m

form

ula

for

max

imum

H

in Ap

pend

ix A.

03

(4)

Point

sa

me

on

all

drive

rs.

G

(5)

No

tolera

nce

for

gagin

g dia

mete

r is

given

. If

the

gagin

g dia

mete

r of

the

ga

ge

used

dif

fers

from

tab

ulated

va

lue,

the

protru

sion

will

be

affec

ted

acco

rding

ly an

d the

b,

L,

prope

r pro

trusio

n va

lues

mus

t be

rec

alcula

ted

using

the

for

mula

s sh

own

in Ap

pend

ix I.

(6)

Not

prac

tical

to

gage

. i


STD-ASME 818.b.3-ENGL 3998 m 0759670 0634384 827

ASME B18.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS

Edge of head may be

A min. rounded or flat

Al

TABLE 2A DIMENSIONS OF SLOTTED 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS Nominal Size or

Depth Gaging Diameter F Diameter

Diameter [Note (I)] Max. Min. [Note (211 Max. Min. Max. Min. Max. Min. [Note (311

Head

A

Head Diameter Width Basic Screw Height

H. Ref.

Slot Slot Protrusion Above Gaging

J T [Note (311 G

O000 0.0210 O00 0.0340 O0 0.0470

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 6 0.1380 8 0.1640 10 0.1900

0.2500 0.3125

3/8 0.3750

O. 040 0.060 0.087

0.112 0.137 O. 162 0.187

0.212 0.262 0.312 0.362

0.477 0.597 0.717

0.035 0.009 0.008 0.055 0.014 0.012 0.080 0.020 0.017

0.095 0.026 0.023 0.118 0.031 0.026 0.142 0.037 0.031 0.165 0.043 0.035

0.188 0.049 0.039 0.235 0.060 0.048 0.282 0.072 0.054 0.329 0.083 0.060

0.437 0.110 0.075 0.550 0.138 0.084 0.662 0.165 0.094

0.005 0.008 0.010

0.016 0.019 0.023 0.027

0.031 0.039 0.045 0.050

0.064 0.072 0.081

0.008 0.004 0.01 1 0.007 0.013 0.008

0.013 0.008 0.016 0.010 0.019 0.012 0.022 0.014

0.024 0.017 0.030 0.022 0.036 0.027 0.042 0.031

0.055 0.042 0.069 0.053 0.083 0.065

Note (4) Note (4) Note (4)

0.020 0.021 0.022 0.024

0.025 0.028 0.031 0.034

0.040 0.047 0.053


0.012 0.013 0.014 0.01 5

0.016 0.017 0.019 0.021

0.025 0.030 0.034


0.074 0.098 0.121 0.144

O. 167 0.214 0.261 0.307

0.415 0.526 0.638

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion

will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I. (4) Not practical to gage.

12


MACHINE SCREWS AND MACHINE SCREW NUTS ASME 818.6.3-1998

This type of recess has a large center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.

Edge of head may be


LG-4 L Protrusion gage

6 F i n .

Not to exceed maximum major diameter of thread

Optional Shoulder for Long Screws with

Reduced Body

TABLE 2B DIMENSIONS OF TYPE I CROSS RECESSED 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS

~~ ~ ~ ~~~~ ~~

Nominal Size or Basic Recess Gaging Gaging

Screw Diameter Height Recess Recess , Recess Penetration Diameter F Diameter

Diameter [Note (111 Max. Min. [Note (211 M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (311

Protrusion Above

Head Head

H, Ref. Diameter Depth Width Driver Gaging Depth [Note (3)1 G A

O 0.0600 0.112 0.095 0.026 0.054 0.027 0.013 O 0.028 0.012 0.020 0.012 0.074 1 0.0730 0.137 0.118 0.031 0.062 0.035 0.014 O 0.036 0.020 0.021 0.013 0.098 2 0.0860 0.162 0.142 0.037 0.088 0.048 0.012 1 0.049 0.033 0.022 0.014 0.121 3 0.0990 0.187 0.165 0.043 0.096 0.055 0.014 1 0.056 0.040 0.024 0.015 0.144

4 0.1120 0.212 0.188 0.049 0.110 0.070 0.018 1 0.071 0.055 0.025 0.016 0.167 6 0.1380 0.262 0.235 0.060 0.148 0.074 0.027 2 0.075 0.052 0.028 0.017 0.214 8 0.1640 0.312 0.282 0.072 0.162 0.090 0.028 2 0.090 0.067 0.031 0.019 0.261

10 0.1900 0.362 0.329 0.083 0.178 0.104 0.030 2 0.105 0.082 0.034 0.021 0.307

'/e 0.2500 0.477 0.437 0.110 0.240 0.124 0.033 3 0.118 0.095 0.040 0.025 0.415 0.3125 0.597 0.550 0.138 0.310 0.157 0.053 4 0.148 0.126 0.047 0.030 0.526

'//S 0.3750 0.717 0.662 0.165 0.336 0.182 0.056 4 0.173 0.151 0.053 0.034 0.638

GENERAL NOTE: For additional requirements refer t o para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion

will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I.

13


ASME 618.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS

Edge of head may be rounded or flat

This type of recess has a large center Protrusion gage opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.

62[min.



Reduced Body

TABLE 2C DIMENSIONS OF TYPE IA CROSS RECESSED 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS

Nominal Size or Basic

Recess Gaging Gaging

Screw Diameter Height Recess Recess Recess Penetration Diameter F Diameter

Diameter [Note (111 Max. Min. [Note (211 M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (311

O 0.0600 0.112 0.095 0.026 0.054 0.028 0.018 O 0.029 0.013 0.020 0.012 0.074 1 0.0730 0.137 0.118 0.031 0.062 0.036 0.018 O 0.037 0.021 0.021 0.013 0.098 2 0.0860 0.162 0.142 0.037 0.088 0.048 0.028 1 0.046 0.030 0.022 0.014 0.121 3 0.0990 0.187 0.165 0.043 0.096 0.055 0.029 1 0.053 0.037 0.024 0.015 0.144

Protrusion Above

Head

A

Head

H, Ref. Diameter Depth Width Driver Gaging Depth [Note (311 G

4 0.1120 0.212 0.188 0.049 0.1 10 0.070 0.029 1 0.068 0.052 0.025 0.016 0.167 6 0.1380 0.262 0.235 0.060 0.148 0.077 0.041 2 0.071 0.053 0.028 0.017 0.214 8 0.1640 0.312 0.282 0.072 0.162 0.092 0.041 2 0.086 0.068 0.031 0.019 0.261 10 0,1900 0.362 0.329 0.083 0.178 0.107 0.041 2 0.101 0.083 0.034 0.021 0.307

0.2500 0.477 0.437 0.110 0.240 0.126 0.056 3 0.114 0.096 0.040 0.025 0.415 0.3125 0.597 0.550 0.138 0.310 0.163 0.085 4 0.145 0.127 0.047 0.030 0.526

'//B 0.3750 0.717 0.662 0.165 0.336 0.187 0.085 4 0.170 0.152 0.053 0.034 0.638



14



This type of recess consists of two intersecting slots with parallel sides converging to a slightly truncated aDex at bottom of recess.

Edge of head may be


l " L 4 L Protrusion gage

k i n .



Reduced Body

TABLE 2D DIMENSIONS OF TYPE II CROSS RECESSED 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS


Screw Height Recess Recess Recess Driver Diameter F Diameter Diameter [Note ( l ) ] Max. Min. [Note (211 M, Ref. T, Ref. N, Ref. [Note (311 Max. Min. Max. Min. [Note (411

Protrusion Above

Head

A

Head Gaging Gaging

H, Ref. Diameter Depth Width Size Gaging Depth [Note 14)l G

~~ ~ ~ _ _ _ _ _ _ _ _______

O 0.0600 0.112 0.095 1 0.0730 0.137 0.118 2 0.0860 0.162 0.142 3 0.0990 0.187 0.165

4 0.1120 0.212 0.188 6 0.1380 0.262 0.235 8 0.1640 0.312 0.282

10 0.1900 0.362 0.329

'/4 0.2500 0.477 0.437 5/16 0.3125 0.597 0.550 '//B 0.3750 0.717 0.662

0.026 0.031 0.037 0.043

0.049 0.060 0.072 0.083

0.110 O. 138 O. 165

0.057 0.078 0.092 0.113

0.131 0.157 O. 185 0.219

0.288 0.355 0.433

0.026 0.020 0.040 0.023 0.048 0.025 0.061 0.027

0.070 0.029 0.086 0.033 0.102 0.037 0.1 22 0.042

0.164 0.053 0.207 0.063 0.258 0.075

. . . Note (5)

. . . Note (5)

. . . 0.025

. . . 0.039

. . . 0.051

. . . 0.068

. . . 0.086

. . . o. 1 o9

. . . O. 154

. . . 0.197

. . . 0.249

Note (5) Note (5)

0.01 5 0.028

0.036 0.051 0.067 0.087

O. 132 0.175 0.226

0.020 0.012 0.074 0.021 0.013 0.098 0.022 0.014 0.121 0.024 0.015 0.144

0.025 0.016 0.167 0.028 0.017 0.214 0.031 0.019 0.261 0.034 0.021 0.307

0.040 0.025 0.415 0.047 0.030 0.526 0.053 0.034 0.638

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) Point same on all drivers. (4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion

will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix l. (5) Not practical to gage.

15


ASME 818.6.3-1998

I


Edge of head may be


TABLE 3A DIMENSIONS OF SLOlTED CLOSE TOLERANCE 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS


Diameter

Head

A

Head Diameter Width Screw Height

H, Ref.

Slot Slot Protrusion Above Gaging

G

Depth Gaging Diameter F Diameter J T [Note (311

[Note (1)1 Max. Min. [Note (211 Max. Min. Max. Min. Max. Min. [Note (311

4 0.1120 0.212 0.188 0.049 0.039 0.031 0.024 0.017 0.025 0.019 0.167 6 0.1380 0.262 0.235 0.060 0.048 0.039 0.030 0.022 0.028 0.021 0.2 14 8 0.1640 0.312 0.282 0.072 0.054 0.045 0.036 0.027 0.031 0.023 0.261

10 0.1900 0.362 0.329 0.083 0.060 0.050 0.042 0.031 0.034 0.026 0.307

0.2500 0.477 0.437 0.110 0.075 0.064 0.055 0.042 0.040 0.031 0.41 5 V16 0.3125 0.597 0.550 O. 138 0.084 0.072 0.069 0.053 0.047 0.037 0.526 3/8 0.3750 0.717 0.662 O. 165 0.094 0.081 0.083 0.065 0.053 0.042 0.638

7/16 0.4375 0.837 0.774 O. 193 0.094 0.081 0.097 0.076 0.060 0.047 0.750

0.5000 0.957 0.887 0.221 0.106 0.091 0.111 0.088 0.066 0.053 0.862 0.5625 1.077 1.000 0.249 0.118 0.102 0.125 0.099 0.073 0.058 0.974 0.6250 1.197 1.112 0.276 0.133 0.116 0.139 0.111 0.080 0.063 1 .O86

GENERAL NOTE: For additional requirements refer t o para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion


16


STDmASME BLB.b-3-ENGL L998 9 0759670 ObL4189 309



TABLE 3B

f in.

Not to exceed maximum major

thread 1 diameter of


Reduced Body

DIMENSIONS OF TYPE I CROSS RECESSED CLOSE TOLERANCE 100 dea FLAT


Screw Diameter [Note 1111

Head Diameter

A

Max. Min.

4 0.1120 6 0.1380 8 0.1640

10 0.1900

0.212 0.188 0.262 0.235 0.312 0.282 0.362 0.329

COUNTERSUNK HEAD MACHINE SCREWS ..

Protrusion Above

Head Recess Gaging Height Recess Recess Recess H, Ref. Diameter Depth Width Driver Gaging Depth [Note I3l1

[Note 1211 M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min.

0.049 0.110 0.070 0.018 1 0.071 0.055 0.025 0.019 0.060 0.148 0.074 0.027 2 0.075 0.052 0.028 0.021 0.072 0.162 0.090 0.028 2 0.090 0.067 0.031 0.023 0.083 0.178 0.104 0.030 2 0.105 0.082 0.034 0.026

Penetration Diameter F Gaging

Diameter G

[Note (311

0.167 0.214 0.261 0.307

0.2500 0.477 0.437 0.110 0.240 0.124 0.033 3 0.118 0.095 0.040 0.031 0.415 5/16 0.3125 0.597 0.550 0.138 0.310 0.157 0.053 4 0.148 0.126 0.047 0.037 0.526

0.3750 0.717 0.662 0.165 0.336 0.182 0.056 4 0.173 0.151 0.053 0.042 0.638 '/,e 0.4375 0.837 0.774 0.193 0.360 0.207 0.060 4 0.198 0.176 0.060 0.047 0.750

'12 0.5000 0.957 0.887 0.221 0.386 0.234 0.063 4 0.226 0.204 0.066 0.053 0.862 ' / / I S 0.5625 1.077 1.000 0.249 0.418 0.265 0.069 4 0.256 0.234 0.073 0.058 0.974

'/B 0.6250 1.197 1.112 0.276 0.504 0.265 0.073 5 0.248 0.222 0.080 0.063 1.086

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted, (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion

wil l be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix 1.

17


ASME B18.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS

Edge of head may be rounded or flat

This type of recess has a large center Protrusion gage opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.

zimi n



Reduced Body

TABLE 3C DIMENSIONS OF TYPE IA CROSS RECESSED CLOSE TOLERANCE 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS

Protrusion " . . Recess Above Nominal Size or Penetration Gaging Gaging

Gaging Diameter F Diameter

Diameter Depth [Note (311 G

[Note (111 Max. Min. [Note (2)] M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (311

Head

A

Head Basic Screw Diameter Height Recess Recess Recess

H, Ref. Diameter Depth Width Driver

4 0.1120 0.212 0.188 0.049 0.1 10 0.070 0.029 1 0.068 0.052 0.025 0.019 0.167 6 0.1380 0.262 0.235 0.060 0.148 0.077 0.041 2 0.071 0.053 0.028 0.021 0.214 8 0.1640 0.312 0.282 0.072 0.162 0.092 0.041 2 0.086 0.068 0.031 0.023 0.261

10 0.1900 0.362 0.329 0.083 0.178 0.107 0.041 2 0.101 0.083 0.034 0.026 0.307

0.2500 0.477 0.437 0.110 0.240 0.126 0.056 3 0.114 0.096 0.040 0.031 0.415 5/16 0.3125 0.597 0.550 0.138 0.310 0.163 0.085 4 0.145 0.127 0.047 0.037 0.526 '4 0.3750 0.717 0.662 0.165 0.336 0.187 0.085 4 0.170 0.152 0.053 0.042 0.638

7/16 0.4375 0.837 0.774 0.193 0.360 0.208 0.086 4 0.194 0.176 0.060 0.047 0.750

v2 0.5000 0.957 0.887 0.221 0.386 0.239 0.086 4 0.222 0.204 0.066 0.053 0.862 0.5625 1.077 1.000 0.249 0.418 0.271 0.086 4 0.253 0.235 0.073 0.058 0.974 0.6250 1.197 1.112 0.276 0.488 0.256 0.097 5 0.228 0.207 0.080 0.063 1.086


wil l be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix 1 .


“ X N E SCREWS AND MACHINE SCREW NUTS ASME B18.6.3-1998

This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.

L Protrusion gage

-c( 0.062 min.



Reduced Body

TABLE 3 0 DIMENSIONS OF TYPE II CROSS RECESSED CLOSE TOLERANCE 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS

Nominal Size or

Basic Screw Diameter [Note (111

Head Diameter

A

Max. Min.

Head Height Recess H, Ref. Diameter

[Note (211 M, Ref.

4 0.1120 6 0.1380 8 0.1640

10 0.1900

’/d 0.2500 716 0.3125

’/B 0.3750 7/16 0.4375

’/* 0.5000 ’116 0.5625

5/8 0.6250

0.212 0.188 0.262 0.235 0.312 0.282 0.362 0.329

O. 049 0.131 0.060 O. 157 0.072 0.185 0.083 0.219

Recess Depth T, Ref.

0.070 0.086 0.102 o. 122

Recess Width N, Ref.

0.029 0.033 0.037 0.042

0.477 0.437 0.110 0.288 0.164 0.053 0.597 0.550 0.138 0.355 0.207 0.063 0.717 0.662 0.165 0.433 0.258 0.075 0.837 0.774 0.193 0.496 0.302 0.085

0.957 0.887 0.221 0.555 0.338 0.093 1.077 1.000 0.249 0.628 0.385 0.104 1.197 1.112 0.276 0.687 0.424 0.113

Protrusion Recess Above

Penetration Gaging Driver Gaging Diameter F

[Note (3)1 Max. Min. Max. Min. Size Depth [Note (411

Gaging Diameter

G [Note (411

. . . 0.051 0.036 0.025 0.019

. . . 0.068 0.051 0.028 0.021

. . . 0.086 0.067 0.031 0.023

. . . 0.109 0.087 0.034 0.026

. . . 0.154 0.132 0.040 0.031

. . . 0.197 0.175 0.047 0.037

. . . 0.249 0.226 0.053 0.042

. . . 0.292 0.269 0.060 0.047

. . . 0.328 0.304 0.066 0.053

. . . 0.376 0.352 0.073 0.058

. . . 0.415 0.390 0.080 0.063

O. 167 0.214 0.261 0.307

0.41 5 0.526 0.638 0.750

0.862 0.974 1 .O86

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) Point same on all drivers. (4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion


19


Edge

of

he

ad

may

be

fla

t or

ro

unde

d

Prot

rusio

n ga

ge

HOP

L,

(see

pa

ra.

2.2)

-d

TABL

E 4A

IL

LUST

RAT

ION


AZ

TABL

E 4A

D

IMEN

SIO

NS

OF

SLO

TTED

O

VAL

CO

UN

TER

SUN

K H

EAD

M

ACH

INE

SCR

EWS

5 K No

min

al

Size

Pr

otru

sion

Abov

e s

or

Basi

c He

ad

Head

To

tal

H Sl

ot

Slot

G

aging

Di

amet

er

s

Scre

w Le

ngth

Di

amet

er

Side

ea

d He

ad

Gag

ing

v,

Heig

ht

Cr o

wn

Heig

ht

0,

Wid

th

Dept

h F

[Not

e (5

11

Diam

eter

Diam

eter

L

A H,

Re

f. He

ight

Re

f. J

T G

[Not

e (1

)1

00

0.047

0

0 0.0

600

1 0.0

730

2 0.0

860

3 0.0

990

[Not

e (2

11

Max

.

0.087

‘h 0.1

12

l/B

0.137

‘h 0.1

62

‘h 0.1

87

Min.

[N

ote

(311

C.

Re

f. [N

ote

(411

M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

[N

ote

(511

2 D

0.080

0.0

28

0.014

0.096

0.0

35

0.021

0.1

20

0.043

0.0

25

0.144

0.0

51

0.029

0.1

67

0.059

0.0

33

0.042

0.0

17

0.056

0.0

23

0.068

0.0

26

0.080

0.0

31

0.092

0.0

35

0.104

0.0

39

0.116

0.0

43

0.128

0.0

48

0.010

0.016

0.019

0.023

0.027

0.023

0.030

0.038

0.045

0.052

0.016

0.025

0.031

0.037

0.043

Note

(6)

Note

(6)

0.047

0.0

31

0.053

0.0

35

0.058

0.0

39

0.064

0.0

44

Note

(6)

2

0.078

f?

0.101

m

0.124

:

0.148

?i z

0.172

z

0.196

2

0.220

4 0.1

120

5 0.1

250

6 0.1

380

8 0.1

640

10

0.190

0

h)

12

0.216

0

‘/4

0.250

0

5/16

0.312

5

3/8

0.375

0

‘/,G

0.437

5

‘/*

0.500

0

9/6

0.562

5

“/I

0.625

0

3/.s

0.2

12

3/6

0.237

3/16

0.262

sh

0.312

%ii

0.362

“43

0.4

12

%6

0.477

5;

0.597

g/6

0.717

“h

0.760

%

0.815

0.932

1.050

0.191

0.0

67

0.037

0.215

0.0

75

0.041

0.238

0.0

83

0.045

0.031

0.

059

0.04

9 0.0

69

0.048

0.035

0.0

67

0.055

0.0

75

0.053

0.039

0.0

74

0.060

0.0

80

0.057

0.285

0.1

00

0.052

0.1

52

0.054

0.0

45

0.088

0.0

72

0.091

0.0

66

0.267

0.333

0.1

16

0.060

0.1

76

0.060

0.0

50

0.103

0.0

84

0.102

0.0

75

0.313

0.380

0.1

32

0.068

0.2

00

0.067

0.0

56

0.117

0.0

96

0.113

0.0

84

0.362

0.442

0.1

53

0.079

0.2

32

0.075

0.0

64

0.136

0.1

12

0.129

0.0

95

0.424

0.556

0.1

91

0.099

0.2

90

0.084

0.0

72

0.171

0.1

41

0.155

0.1

17

0.539

0.670

0.2

30

0.117

0.3

47

0.094

0.0

81

0.206

0.1

70

0.182

0.1

39

0.653

0.715

0.2

23

0.122

0.3

45

0.094

0.0

81

0.210

0.1

74

0.195

0.1

50

0.690

0.765

0.8

78

0.990

0.223

0.1

31

0.354

0.1

06

0.09

1 0.2

16

0.176

0.2

12

0.163

0.7

39

0.260

0.1

50

0.410

0.1

18

0.102

0.2

50

0.207

0.2

39

0.184

0.8

51

0.298

0.1

69

0.467

0.1

33

0.116

0.2

85

0.235

0.2

66

0.206

0.9

62

0.372

0.2

06

0.578

0.1

49

0.131

0.3

53

0.293

0.3

18

0.240

1.1

86

“/4

0.750

0 1.2

85

1.215

GENE

RAL

NOTE

S:

(a)

For

addit

ional

requ

irem

ents

refer

to

pa

ra.

2.

(b)

For

refer

ence

, se

e Ta

ble

4A

Illustr

ation

on

pre

vious

pa

ge.

NOTE

S:

(1)

Whe

re sp

ecify

ing

nom

inal

size

in de

cimals

, ze

ros

prece

ding

decim

al an

d in

the

fourth

de

cimal

place

sh

all

be

omitte

d.

(2)

Scre

ws

of

these

len

gths

and

shor

ter

shall

ha

ve

unde

rcut

head

s as

sh

own

in Ta

ble

6A.

(3)

Tabu

lated

va

lues

deter

mine

d fro

m

form

ula

for

max

imum

H

in Ap

pend

ix A.

(4

) Ta

bulat

ed

value

s de

term

ined

from

for

mula

fo

r m

axim

um

0 in

Appe

ndix

A.

R

(5)

No

tolera

nce

for

gagin

g dia

mete

r is

given

. If

the

gagin

g dia

mete

r of

the

ga

ge

used

dif

fers

from

tab

ulated

va

lue,

the

protru

sion

will

be

affec

ted

acco

rding

ly an

d the

,$

prope

r pro

trusio

n va

lues

mus

t be

rec

alcula

ted

using

the

for

mula

s sh

own

in Ap

pend

ix I.

W

(6)

Not

prac

tical

to

gage

. m

&I

b z 8


03

pa

F w

w

This

typ

e of

re

cess

ha

s a

larg

e ce

nter

op

enin

g,

tape

red

wing

s,

and

blun

t bo

ttom

, wi

th

all

edge

s re

lieve

d or

ro

unde

d.

p-“-1

,-E

dgeo

f he

ad

may

be

fla

t or

ro

unde

d

Prot

rusio

n ga

ge

k- L,

(s

ee

para

. 2.

2)

-4

TAB

LE

4B

ILLU

ST

RA

TIO

N


s m

TABL

E 4B

D

IMEN

SIO

NS

OF

TYPE

I C

RO

SS

REC

ESSE

D

OVA

L C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S %

Pr

otru

sion

if

Nom

inal

Si

ze

Head

To

tal

Abov

e s cn

or

Basi

c He

ad

Side

He

ad

Head

Re

cess

G

aging

Scre

w Le

ngth

Di

amet

er

Heig

ht

Crow

n Pe

netra

tion

Diam

eter

F

Gag

ing

2 He

ight

Re

cess

Re

cess

Re

cess

Di

amet

er

L A

Diam

eter

Q

H.

Ref.

Heig

ht

0,

Ref.

Diam

eter

De

pth

Wid

th

Drive

r G

aging

De

pth

[Not

e (5

11

G

[Not

e W

I [N

ote

(211

M

ax.

Min.

[N

ote

1311

C,

Re

f. [N

ote

(411

M

, Re

f. T,

Ref

. N,

Re

f. Si

ze

Max

. M

in.

Max

. M

in.

5 [N

ote

(511

2 -

0 0.

0600

1 0.

0730

2

0.08

60

3 0.

0990

‘h

0.11

2

'43

0.13

7

23

0.16

2

'/, 0.

187

0.09

6 0.

120

0.14

4

0.16

7

0.03

5 0.

043

0.05

1 0.

059

0.02

1

0.02

5 0.

029

0.03

3

0.05

6 0.

068

0.08

0 0.

092

0.06

8 0.

070

0.10

6 0.

118

0.03

6 0.

039

0.06

0 0.

072

0.01

4 0.

015

0.01

8 0.

019

0.03

8 0.

041

0.06

2 0.

074

0.02

0 0.

023

0.04

5 0.

057

0.04

7

0.05

3 0.

058

0.06

4

0.03

1 0.

035

0.03

9 0.

044

0.07

8 5

0.10

1 g

0.12

4 it

0.14

8 s

0.17

2 E

0.19

6 i?

!

4 0.

1120

%

6 0.

212

0.19

1 0.

067

0.03

7 0.

104

0.13

0 0.

086

0.01

9 1

0.08

7 0.

070

0.06

9 0.

048

5 0.

1250

%

s 0.

237

0.21

5 0.

075

0.04

1 0.

116

0.15

2 0.

073

0.02

8 2

0.07

4 0.

050

0.07

5 0.

053

6 0.

1380

%

3 0.

262

0.23

8 0.

083

0.04

5 0.

128

0.17

2 0.

092

0.03

0 2

0.09

4 0.

069

0.08

0 0.

057

0.22

0

8 0.

1640

sh

0.

312

0.28

5 0.

100

0.05

2 0.

152

0.18

6 0.

107

0.03

1 2

0.10

8 0.

084

0.09

1 0.

066

0.26

7 10

0.

1900

%

6 0.

362

0.33

3 0.

116

0.06

0 0.

176

0.20

2 0.

125

0.03

3 2

0.12

6 0.

102

0.10

2 0.

075

0.31

3 E

12

0.21

60

"h

0.41

2 0.

380

0.13

2 0.

068

0.20

0 0.

264

0.14

0 0.

038

3 0.

135

0.11

1 0.

113

0.08

4 0.

362

& 0.

2500

7/

s 0.

477

0.44

2 0.

153

0.07

9 0.

232

0.28

4 0.

160

0.04

0 5/

,6

0.31

25

5;

0.59

7 0.

556

0.19

1 0.

099

0.29

0 0.

384

0.22

6 0.

065

"/8

0.37

50

9/16

0.

717

0.67

0 0.

230

0.11

7 0.

347

0.40

4 0.

245

0.06

8 v&

g 0.

4375

%

0.

760

0.71

5 0.

223

0.12

2 0.

345

0.41

6 0.

257

0.07

0

0.15

6 0.

131

0.12

9 0.

095

0.42

4 0.

218

0.19

4 0.

155

0.11

7 0.

539

0.23

7 0.

213

0.18

2 0.

139

0.65

3 0.

249

0.22

5 0.

195

0.15

0 0.

690

5;

0.50

00

“/a

0.81

5

g/16

0.

5625

0.

932

5/a

0.62

50

1.05

0

"/4

0.75

00

. .

. 1.

285

0.76

5 0.

223

0.13

1 0.

354

0.43

0 0.

271

0.87

8 0.

260

0.15

0 0.

410

0.46

2 0.

304

0.99

0 0.

298

0.16

9 0.

467

0.58

0 0.

340

1.21

5 0.

372

0.20

6 0.

578

0.64

2 0.

406

0.07

1 4

0.26

3 0.

239

0.21

2 0.

163

0.73

9 0.

075

4 0.

296

0.27

2 0.

239

0.18

4 0.

851

0.08

1 5

0.32

3 0.

291

0.26

6 0.

206

0.96

2 0.

088

5 0.

388

0.35

7 0.

318

0.25

1 1.

186

GEN

ERAL

NO

TES:

(a

) Fo

r ad

ditio

nal

requ

irem

ents

refe

r to

pa

ra.

2.

fb)

For

refe

renc

e,

see

Tabl

e 48

Illu

stra

tion

on

prev

ious

page

.

NOTE

S:

(I)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

. (2

) Sc

rews

of

th

ese

leng

ths

and

shor

ter

shal

l ha

ve

unde

rcut

he

ads

as

show

n in

Ta

ble

66.

(3)

Tabu

late

d va

lues

de

term

ined

from

fo

rmula

fo

r m

axim

um

H in

Ap

pend

ix A.

(4

) Ta

bula

ted

valu

es

dete

rmine

d fro

m

form

ula

for

max

imum

0

in

Appe

ndix

A.

R

(5)

No

tole

ranc

e fo

r ga

ging

dia

met

er

is

given

. If

the

gagi

ng

diam

eter

of

th

e ga

ge

used

di

ffers

fro

m

tabu

late

d va

lue,

the

prot

rusio

n w

ill be

af

fect

ed

acco

rdin

gly a

nd

the

2

prop

er

prot

rusio

n va

lues

m

ust

be

reca

lcula

ted

usin

g th

e fo

rmul

as

show

n in

Ap

pend

ix I.

m

p3

P,

u I, ;


This

typ

e of

re

cess

ha

s a

larg

e ce

nter

op

enin

g,

wide

st

raig

ht

wing

s,

and

blun

t bo

ttom

, wi

th

all

edge

s re

lieve

d or

ro

unde

d.

Prot

rusio

n ga

ge

4 0

k &

=----

-+

FL

LO

(see

pa

ra.

2.2)

.-d

TABL

E 4C

IL

LUST

RAT

ION


3 5 2 m

TABL

E 4C

D

IMEN

SIO

NS

OF

TYPE

IA

CR

OSS

R

ECES

SED

O

VAL

CO

UN

TER

SUN

K H

EAD

M

ACH

INE

SCR

EWS

B Pr

otrus

ion

!Y

Nom

inal

Size

Head

To

tal

Abov

e 5

or

Basic

He

ad

Diam

eter

Side

Head

He

ad

Rece

ss

Gagin

g Ga

ging

z

Scre

w Le

ngth

Heigh

t Cr

own

A He

ight

Rece

ss

Rece

ss

Rece

ss

Pene

tratio

n Di

amete

r F

Diam

eter

0 Di

amete

r 1

H,

Ref.

Heigh

t 0,

Re

f. Di

amete

r De

pth

Widt

h Dr

iver

Gagin

g De

pth

[Not

e H

I G

5

INot

e fj)

l [N

ote

Ml

Max

. M

in.

[Note

I3)

l C,

Re

f. [N

ote

I411

M,

Ref.

T

Ref.

N,

Ref.

Size

Max

. M

in.

Max

. M

in.

INote

15

jl 4;

I

0 0.

0600

1

0.07

30

2 0.

0860

3

0.09

90

‘43

0.11

2 0.

096

k 0.

137

0.12

0 '/8

0.

162

0.14

4 '47

0.

187

0.16

7

%a

0.21

2 0.

191

%6

0.23

7 0.

215

%a

0.26

2 0.

238

'/4

0.31

2 0.

285

%6

0.36

2 0.

333

78

0.41

2 0.

380

'h 0.

477

0.44

2 'h

0.59

7 0.

556

g46

0.71

7 0.

670

%

0.76

0 0.

715

=/4

0.81

5 0.

765

. 0.

932

0.87

8 .

. .

1.05

0 0.

990

. 1.

285

1.21

5

0.03

5 0.

021

0.05

6 0.

068

0.04

0 0.

018

0.04

3 0.

025

0.06

8 0.

070

0.04

3 0.

018

0.05

1 0.

029

0.08

0 0.

106

0.06

5 0.

029

0.05

9 0.

033

0.09

2 0.

118

0.07

7 0.

030

0.04

2 0.

024

0.04

7 0.

031

0.04

3 0.

027

0.05

3 0.

035

0.06

2 0.

046

0.05

8 0.

039

0.07

4 0.

058

0.06

4 0.

044

0.07

8 :

0.10

1 g

0.12

4 ii

0.14

8 d

0.06

7 0.

037

0.10

4 0.

130

0.089

0.

030

1 0.

086

0.07

0 0.

069

0.04

8 0.

172

c5

0.07

5 0.

041

0.11

6 0.

152

0.08

0 0.

041

2 0.

074

0.05

6 0.

075

0.05

3 0.

196

2 0.

083

0.04

5 0.

128

0.17

2 0.

100

0.04

1 2

0.09

3 0.

075

0.08

0 0.

057

0.22

0

0.100

0.

052

0.15

2 0.

186

0.11

5 0.

041

2 0.

108

0.090

0.0

91

0.06

6 0.

267

0.11

6 0.

060

0.17

6 0.

202

0.13

2 0.

041

2 0.

125

0.10

7 0.

102

0.07

5 0.

313

0.13

2 0.

068

0.20

0 0.

264

0.14

8 0.

056

3 0.

135

0.11

7 0.

113

0.08

4 0.

362

0.15

3 0.0

79

0.23

2 0.

284

0.16

8 0.

057

0.19

1 0.0

99

0.29

0 0.

384

0.23

2 0.

086

0.23

0 0.

117

0.34

7 0.

404

0.25

3 0.

086

0.22

3 0.

122

0.34

5 0.

416

0.26

5 0.

086

0.15

5 0.

137

0.12

9 0.

095

0.42

4 0.

215

0.19

7 0.

155

0.11

7 0.

539

0.23

5 0.

217

0.18

2 0.

139

0.65

3 0.

247

0.22

9 0.

195

0.15

0 0.

690

0.22

3 0.

131

0.35

4 0.

430

0.28

0 0.

086

4 0.

262

0.24

4 0.

212

0.16

3

0.26

0 0.

150

0.41

0 0.

450

0.30

2 0.

087

4 0.

285

0.26

7 0.

239

0.18

4

0.29

8 0.

169

0.46

7 0.

562

0.32

8 0.

098

5 0.

300

0.27

9 0.

266

0.20

6

0.37

2 0.

206

0.57

8 0.

624

0.39

0 0.

099

5 0.

362

0.34

1 0.

318

0.25

1

0.73

9 0.

851

0.96

2

1.18

6

4 0.

1120

5

0.12

50

6 0.

1380

8 0.

1640

10

0.

1900

12

0.21

60

'14

0.25

00

5/e

0.31

25

"/8

0.37

50

7/,&

j 0.

4375

'1,

0.50

00

g/16

0.

5625

"/8

0.

6250

"/4

0.

7500

GEN

ERAL

NO

TES:

(a

) Fo

r ad

ditio

nal

requ

irem

ents

refe

r to

pa

ra.

2.

lb)

For

refe

renc

e,

see

Tabl

e 4C

Illu

stra

tion

on

prev

ious

page

.

NOTE

S:

(1)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

. (2

) Sc

rews

of

th

ese

leng

ths

and

shor

ter

shal

l ha

ve

unde

rcut

he

ads

as

show

n in

Ta

ble

6C.

(3)

Tabu

late

d va

lues

de

term

ined

from

fo

rmula

fo

r m

axim

um

H in

Ap

pend

ix A.

R

(4)

Tabu

late

d va

lues

de

term

ined

from

fo

rmula

fo

r m

axim

um

0 in

Ap

pend

ix A.

3

(5)

No

tole

ranc

e fo

r ga

ging

dia

met

er

is g

iven.

If

the

gagi

ng

diam

eter

of

th

e ga

ge

used

di

ffers

fro

m

tabu

late

d va

lue,

the

prot

rusio

n w

ill be

af

fect

ed

acco

rdin

gly

and

the

prop

er

prot

rusio

n va

lues

m

ust

be

reca

lcula

ted

usin

g th

e fo

rmul

as

show

n in

App

endix

I.

z co

P w


e -I- M

N

This

typ

e of

re

cess

co

nsis

ts

of

two

inte

rsec

ting

slot

s wi

th

para

llel

side

s co

nver

ging

to

a sli

ghtly

tru

ncat

ed

apex

at

bo

ttom

of

re

cess

.

Edge

of

he

ad

may

be

fla

t or

ro

unde

d

Prot

rusio

n ga

ge

+G4

- -

L,

(see

pa

ra.

2.2)

-4

TABL

E 4D

IL

LUST

RAT

ION


h 4;

z TA

BLE

4D

DIM

ENSI

ON

S O

F TY

PE

II C

RO

SS

REC

ESSE

D

OVA

L C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S Is

Protr

usion

5 m

No

mina

l Siz

e He

ad

Tota

l Ab

ove

Head

s

or

Basic

Sid

e He

ad

Head

Ga

ging

(

Scre

w Le

na

-th

Diam

eter A

Heigh

t Cr

own

Heigh

t Re

cess

Re

cess

Re

cess

Dr

iver

Rece

ss

Pene

tratio

n --

-

Diam

eter

L H,

Re

f. He

iaht

0.

Ref.

Diam

eter

Depth

W

idth

Size

Ga

ging

Depth

-

0

jaging

ti

n Di

amete

r F

Diam

eter

[Note

(6

11

_ ifi

0

INot

e W

I IN

ote

(2))

Max

. M

in.

[Note

(3

)] C,

Re

f. [N

ote

(4))

M,

Ref.

T.

kef.

N,

Ref.

[Note

(5

)] M

ax.

Min.

M

ax.

Min.

[N

ote

(6)]

2

0 0.

0600

1 0.

0730

2

0.08

60

3 0.

0990

4 0.

1120

5

0.12

50

6 0.

1380

8 0.

1640

10

0.

1900

12

0.

2160

‘A,

0.25

00

5/16

0.3

125

“/8

0.37

50

?,6

0.43

75

7,

0.50

00

9/16

0.5

625

5/8

0.62

50

74

0.75

00

0.11

2 0.

096

0.03

5 0.

021

0.05

6 0.

078

0.13

7 0.

120

0.04

3 0.

025

0.06

8 0.

092

0.16

2 0.

144

0.05

1 0.

029

0.08

0 0.

114

0.18

7 0.

167

0.05

9 0.

033

0.09

2 0.

133

0.21

2 0.

191

0.06

7 0.

037

0.10

4 0.

151

0.23

7 0.

215

0.07

5 0.

041

0.11

6 0.

169

0.26

2 0.

238

0.08

3 0.

045

0.12

8 0.

188

0.31

2 0.

285

0.10

0 0.

052

0.15

2 0.

224

0.36

2 0.

333

0.11

6 0.

060

0.17

6 0.

260

0.41

2 0.

380

0.13

2 0.

068

0.20

0 0.

297

0.47

7 0.

442

0.15

3 0.

079

0.23

2 0.

344

0.59

7 0.

556

0.19

1 0.

099

0.29

0 0.

432

0.71

7 0.

670

0.23

0 0.

117

0.34

7 0.

509

0.76

0 0.

715

0.22

3 0.

122

0.34

5 0.

554

0.81

5 0.

765

0.22

3 0.

131

0.35

4 0.

593

0.93

2 0.

878

0.26

0 0.

150

0.41

0 0.

640

1.05

0 0.

990

0.29

8 0.

169

0.46

7 0.

640

1.28

5 1.

215

0.37

2 0.

206

0.57

8 0.

640

0.03

6 0.

021

. 0.

048

0.02

4 0.

060

0.02

7 0.

072

0.03

0

0.08

2 0.

032

. 0.

094

0.03

5 0.

106

0.03

8

0.12

4 0.

043

0.14

8 0.

048

0.17

2 0.

054

0.19

5 0.

061

0.25

2 0.

074

0.30

2 0.

086

0.33

2 0.

092

0.35

8 0.

098

0.38

7 0.

104

0.38

7 0.

104

0.38

7 0.

104

Note

(7

) No

te

(7)

0.04

7 0.

031

Note

(7

) No

te

(7)

0.05

3 0.

035

0.04

0 0.

029

0.05

8 0.

039

0.05

3 0.

041

0.06

4 0.

044

0.06

4 0.

052

0.06

9 0.

048

0.07

7 0.

064

0.07

5 0.

053

0.08

9 0.

075

0.08

0 0.

057

0.11

3 0.0

99

0.09

1 0.

066

0.26

7 0.

137

0.12

2 0.

102

0.07

5 0.

313

0.16

2 0.

145

0.11

3 0.

084

0.36

2

0.19

3 0.

176

0.12

9 0.

095

0.42

4 0.

251

0.23

2 0.

155

0.11

7 0.

539

0.30

3 0.

281

0.18

2 0.

139

0.65

3 0.

332

0.31

0 0.

195

0.15

0 0.

690

0.359

0.

335

0.21

2 0.

163

0.73

9 0.3

89

0.36

4 0.

239

0.18

4 0.

851

0.389

0.

364

0.26

6 0.

206

0.96

2 0.3

89

0.36

4 0.

318

0.25

1 1.

186

Y 0.

078

z 0.

101

Ill

0.12

4 g

0.14

8 g z

0.17

2 0.

196

E

0.22

0 2

GEN

ERAL

NO

TES:

(a

) Fo

r ad

ditio

nal

requ

irem

ents

refe

r to

pa

ra.

2.

(b)

For

refe

renc

e,

see

Tabl

e 4D

Illu

stra

tion

on

prev

ious

page

.

NOTE

S:

(1)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

, (2

) Sc

rews

of

th

ese

leng

ths

and

shor

ter

shal

l ha

ve

unde

rcut

he

ads

as

show

n in

Ta

ble

6D.

(3)

Tabu

late

d va

lues

de

term

ined

from

fo

rmula

fo

r m

axim

um

H in

Ap

pend

ix A.

(4

) Ta

bula

ted

valu

es

dete

rmine

d fro

m

form

ula

for

max

imum

0

in

Appe

ndix

A.

D m

(5)

Poin

t sa

me

on

all

drive

rs.

2 (6

) No

to

lera

nce

for

gagi

ng

diam

eter

is

give

n.

If th

e ga

ging

dia

met

er

of

the

gage

us

ed

diffe

rs

from

ta

bula

ted

value

, th

e pr

otru

sion

will

be

affe

cted

ac

cord

ingl

y an

d th

e pr

oper

pr

otru

sion

valu

es

mus

t be

re

calcu

late

d us

ing

the

form

ulas

sh

own

in

Appe

ndix

I.

g

(7)

Not

prac

tical

to

ga

ge.

m

P w I, iz


STDOASME BLB.b.3-ENGL L778 m 0757670 Ob14200 8 T T W

ASME 618.631998 MACHINE SCREWS AND MACHINE SCREW NUTS

Protrusion gage

TABLE 5A DIMENSIONS OF SLOTTED UNDERCUT FLAT COUNTERSUNK HEAD MACHINE SCREWS

Protrusion Above Nominal Size

or Basic Screw Length Diameter Height Width Depth Diameter F Diameter

Diameter L [Note ( I ) ] [Note (2)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. [Note (311

O 0.0600 '18 0.112 0.096 0.025 0.018 0.023 0.016 0.011 0.007 Note (4) Note (4) Note (4) 1 0.0730 '18 0.137 0.120 0.031 0.023 0.026 0.019 0.014 0.009 Note (4) Note (4) Note (4) 2 0.0860 '/R 0.162 0.144 0.036 0.028 0.031 0.023 0.016 0.011 0.029 0.017 0.124

Head Head Slot Slot Gaging Gaging

A H J T [Note (311 G

3 0.0990 'h 0.187 0.167 0.042 0.033 0.035 0.027 0.019 0.012 0.031 0.018 0.148

4 0.1120 3/16 0.212 0.191 0.047 0.038 0.039 0.031 0.022 0.014 0.032 0.019 0.172 5 0.1250 3/16 0.237 0.215 0.053 0.043 0.043 0.035 0.024 0.016 0.034 0.020 0.196 6 0.1380 0.262 0.238 0.059 0.048 0.048 0.039 0.027 0.017 0.036 0.021 0.220

8 0.1640 '14 0.312 0.285 0.070 0.058 0.054 0.045 0.032 0.021 0.039 0.023 0.267

12 0.2160 "* 0.412 0.380 0.092 0.078 0.067 0.056 0.043 0.028 0.045 0.027 0.362

'/4 0.2500 '/16 0.477 0.442 0.107 0.092 0.075 0.064 0.050 0.032 0.050 0.029 0.424 5/16 0.3125 'h 0.597 0.556 0.134 0.116 0.084 0.072 0.062 0.041 0.057 0.034 0.539

0.3750 9/16 0.717 0.670 0.161 0.140 0.094 0.081 0.075 0.049 0.065 0.039 0.653 0.4375 v* 0.760 0.715 0.156 0.133 0.094 0.081 0.072 0.045 0.073 0.044 0.690

'/* 0.5000 14 0.815 0.765 0.156 0.130 0.106 0.091 0.072 0.046 0.081 0.049 0.739

10 0.1900 0.362 0.333 0.081 0.068 0.060 0.050 0.037 0.024 0.042 0.025 0.313

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Screws of these lengths and shorter are undercut. Screws of longer lengths shall have head heights as shown in Table 1A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion

will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I. (4) Not practical to gage.

28


This

ty

pe

of

WCB

SS

has

a la

rge

cent

er

open

ing.

tape

red

win

gs.

and

blunt

bo

nom

, wi

th

all

edge

s re

lieve

d or

ro

unde

d

Prot

rusio

n ga

ge

TABL

E 5B

D

IMEN

SIO

NS

OF

TYPE

I

CR

OSS

R

ECES

SED

U

ND

ERC

UT

FLAT

C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Si

ze

or

Basi

c Sc

rew

Diam

eter

Le

ngth

1

Head

He

ad

Diam

eter

He

ight

A

H

Rece

ss

Prot

rusio

n Ab

ove

Rece

ss

Rece

ss

Rece

ss

Pene

tratio

n G

aging

Di

amet

er

Gag

ing

Diam

eter

Di

amet

er

Dept

h W

idth

Dr

iver

Gag

ing

Dept

h F

[Not

e (3

11

G

[Not

e 11

)l [N

ote

WI

Max

. M

in.

Max

. M

in.

M,

Ref.

T, R

ef.

N,

Ref.

Size

M

ax.

Min.

M

ax.

Min.

[N

ote

(311

0.11

2 0.

096

0.02

5 0.

018

0.06

2 0.

035

0.01

4 0.

137

0.12

0 0.

031

0.02

3 0.

070

0.04

3 0.

015

0.16

2 0.

144

0.03

6 0.

028

0.08

8 0.

048

0.01

7 0.

187

0.16

7 0.

042

0.03

3 0.

096

0.05

5 0.

018

0.03

6 0.

020

Note

(4

) No

te

(4)

Note

(4

) 0.

044

0.02

8 No

te

(4)

Note

(4

) No

te

(4)

0.04

9 0.

033

0.02

9 0.

017

0.12

4 0.

056

0.04

0 0.

031

0.01

8 0.

148

0 0.

0600

1

0.07

30

2 0.

0860

3

0.09

90

4 0.

1120

5

0.12

50

6 0.

1380

0.21

2 0.

191

0.04

7 0.

038

0.110

0.

070

0.01

8 I

0.07

1 0.

055

0.03

2 0.

019

0.17

2 0.

237

0.21

5 0.

053

0.04

3 0.

122

0.08

1 0.

018

1 0.

082

0.06

6 0.

034

0.02

0 0.

196

0.26

2 0.

238

0.05

9 0.

048

0.14

0 0.

066

0.02

5 2

0.06

7 0.

044

0.03

6 0.

021

0.22

0

8 0.

1640

10

0.19

00

12

0.21

60

0.31

2 0.

285

0.07

0 0.

058

0.16

8 0.0

94

0.02

9 2

0.09

5 0.

072

0.03

9 0.

023

0.26

7 0.

362

0.33

3 0.

081

0.06

8 0.

182

0.110

0.

030

2 0.

110

0.08

7 0.

042

0.02

5 0.

313

0.41

2 0.

380

0.09

2 0.

078

0.22

6 0.1

10

0.03

0 3

0.10

4 0.

081

0.04

5 0.

027

0.36

2

‘/4

0.25

00

‘/,s

0.31

25

3/a

0.37

50

‘/,a

0.43

75

‘/*

0.50

00

0.47

7 0.

442

0.10

7 0.

092

0.24

4 0.

124

0.03

2 0.

597

0.55

6 0.

134

0.11

6 0.

310

0.15

7 0.

053

0.71

7 0.

670

0.16

1 0.

140

0.35

8 0.

205

0.06

1 0.

760

0.71

5 0.

156

0.13

3 0.

386

0.23

4 0.

065

0.81

5 0.

765

0.15

6 0.

130

0.40

2 0.

252

0.06

8

0.11

9 0.

096

0.05

0 0.

029

0.42

4 0.

148

0.12

6 0.

057

0.03

4 0.

539

0.19

6 0.

174

0.06

5 0.

039

0.65

3 0.

225

0.20

3 0.

073

0.04

4 0.

690

0.24

1 0.

219

0.08

1 0.

049

0.73

9

GEN

ERAL

NO

TE:

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

NOTE

S:

(1)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

. (2

) Sc

rews

of

th

ese

leng

ths

and

shor

ter

are

unde

rcut

. Sc

rews

of

lon

ger

leng

ths

shal

l ha

ve

head

he

ight

s as

sh

own

in

Tabl

e 18

. R

(3)

No

tole

ranc

e fo

r ga

ging

dia

met

er

is

given

. If

the

gagi

ng

diam

eter

of

th

e ga

ge

used

di

ffers

fro

m

tabu

late

d va

lue,

the

prot

rusio

n w

ill be

af

fect

ed

acco

rdin

gly

and

the

5

prop

er

prot

rusio

n va

lues

m

ust

be

reca

lcula

ted

usin

g th

e fo

rmul

as

show

n in

Ap

pend

ix I.

W

(4)

Not

prac

tical

to

ga

ge.

Fo

0,


This

ty

pe

of

rece

sS

has

a la

rge

cent

er

open

ing,

wide

st

raig

ht

win

gs,

and

blunt

bo

ttom

, wi

th

all

edge

s re

lieve

d or

ro

unde

d.

TABL

E 5C

D

IMEN

SIO

NS

OF

TYPE

IA

CR

OSS

R

ECES

SED

U

ND

ERC

UT

FLAT

C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Si

ze

Head

He

ad

Rece

ss

Prot

rusio

n Ab

ove

or

Basi

c Sc

rew

Leng

th

Diam

eter

He

ight

Pe

netra

tion

Gag

ing

Diam

eter

G

aging

Diam

eter

(Not

: (2

11

A H

Rece

ss

Rece

ss

Rece

ss

Diam

eter

Di

amet

er

Dept

h W

idth

Dr

iver

Gag

ing

Dept

h F

[Not

e (3

)] G

INot

e W

I M

ax.

Min.

M

ax.

Min.

M

, Re

f. T,

Ref

. N,

Re

f. Si

ze

Max

. M

in.

Max

. M

in.

[Not

e (3

11

0 0.0

600

'/8

0.112

0.0

96

0.025

0.0

18

0.062

0.0

36

0.018

Cl

0.0

37

0.021

No

te (4

) No

te (4

) No

te (4

)

1 0.0

730

'4 0.1

37

0.120

0.0

31

0.023

0.0

70

0.044

0.0

18

0 0.0

45

0.029

No

te (4

) No

te (4

) No

te (4

)

2 0.0

860

'h 0.1

62

0.144

0.0

36

0.028

0.0

88

0.048

0.0

28

1 0.0

46

0.030

0.0

29

0.017

0.1

24

3 0.0

990

'4 0.1

87

0.167

0.0

42

0.033

0.0

96

0.055

0.0

29

1 0.0

53

0.037

0.0

31

0.018

0.1

48

4 0.1

120

3/6

0.212

0.1

91

0.047

0.0

38

0.110

0.0

70

0.029

1

0.068

0.0

52

0.032

0.0

19

0.172

5 0.1

250

3/6

0.237

0.2

15

0.053

0.0

43

0.122

0.0

81

0.030

1

0.079

0.0

63

0.034

0.0

20

0.196

6 0.1

380

%5

0.262

0.2

38

0.059

0.0

48

0.140

0.0

69

0.040

2

0.063

0.0

45

0.036

0.0

21

0.220

8 0.1

640

'A

0.312

0.2

85

0.070

0.0

58

0.168

0.0

98

0.041

2

0.091

0.0

73

0.039

0.0

23

0.267

10

0.

1900

%

6 0.3

62

0.333

0.0

81

0.068

0.1

82

0.112

0.0

41

2 0.1

07

0.089

0.0

42

0.025

0.3

13

6

12

0.216

0 %

0.4

12

0.380

0.0

92

0.078

0.2

26

0.112

0.0

55

3 0.1

00

0.082

0.0

45

0.027

0.3

62

2 2 Ill

'/4

0.250

0 %

s 0.4

77

0.442

0.1

07

0.092

0.2

42

0.128

0.0

56

3 0.1

15

0.097

0.0

50

0.029

0.4

24

5/,6

0.3

125

5;

0.597

0.5

56

0.134

0.1

16

0.310

g

0.163

0.0

85

4 0.1

45

0.127

0.0

57

0.034

0.5

39

"/8

0.375

0 %

6 0.7

17

0.670

0.1

61

0.140

0.3

58

0.211

0.0

86

4 0.1

93

0.175

0.0

65

0.039

0.6

53

;

'/16

%

z 0.4

375

0.760

0.7

15

0.156

0.1

33

0.386

0.2

39

0.086

4

0.222

0.2

04

0.073

0.0

44

0.690

'/*

0.500

0 sh

0.8

15

0.765

0.1

56

0.130

0.4

02

0.256

0.0

86

4 0.2

38

0.220

0.0

81

0.049

0.7

39

I: z

GENE

RAL

NOTE

: Fo

r ad

dition

al re

quire

men

ts re

fer

to

para

. 2.

z

NOTE

S:

(1)

Whe

re sp

ecify

ing

nom

inal

size

in de

cimals

, ze

ros

prece

ding

decim

al an

d in

the

fourth

de

cimal

place

sh

all

be

omitte

d.

s

(2)

Scre

ws

of

these

len

gths

and

shor

ter

are

unde

rcut.

Scre

ws

of

longe

r len

gths

shall

ha

ve

head

he

ights

as

show

n in

Table

IC

. z

(3)

No

tolera

nce

for

gagin

g dia

mete

r is

given

. If

the

gagin

g dia

mete

r of

the

ga

ge

used

dif

fers

from

tab

ulated

va

lue,

the

protru

sion

will

be

affec

ted

acco

rding

ly an

d the

u)

pro

per

protru

sion

value

s m

ust

be

recalc

ulated

us

ing

the

form

ulas

show

n in

Appe

ndix

I. (4

) No

t pr

actic

al to

ga

ge.

s:

zz

E 2


TABL

E 5D

D

IMEN

SIO

NS

OF

TYPE

II

CR

OSS

R

ECES

SED

U

ND

ERC

UT

FLAT

C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S 2 c/

7 No

mina

l Siz

e He

ad

Head

Pr

otrus

ion

Abov

e

Diam

eter

Heigh

t Re

cess

Pe

netra

tion

Gagin

g Di

amete

r Ga

ging

s

or

Basic

Sc

rew

Leng

th Re

cess

Re

cess

Re

cess

Dr

iver

Diam

eter

r” Di

amete

r L

A H

Diam

eter

Depth

W

idth

Size

Gagin

g De

pth

F [N

ote

(411

G

z

[Not

e (1

11

0 0.0

600

1 0.0

730

2 0.0

860

3 0.0

990

[Note

(2

)] M

ax.

Min.

M

ax.

Min.

M

, Re

f. J.

Ref.

N,

Re

f. [N

ote

(311

M

ax.

Min.

M

ax.

Min.

[N

ote

(411

5 c/

l ‘/8

0.1

12

0.096

0.0

25

0.018

‘47

0.1

37

0.120

0.0

31

0.023

‘43

0.1

62

0.144

0.0

36

0.028

‘18

0.187

0.1

67

0.042

0.0

33

0.067

0.0

29

0.082

0.0

39

0.100

0.0

50

0.111

0.0

58

0.020

0.022

0.025

0.026

.

Note

(5)

Note

(5)

Note

(5)

Note

(5)

Note

(5)

Note

(5)

Note

(5)

Note

(5)

Note

(5)

Note

(5)

0.030

0.0

20

0.029

0.0

17

0.124

0.038

0.0

27

0.031

0.0

18

0.148

4 0.1

120

%s

0.212

0.1

91

0.047

0.0

38

0.129

0.0

70

5 0.1

250

34s

0.237

0.2

15

0.053

0.0

43

0.147

0.0

80

6 0.1

380

3/s

0.262

0.2

38

0.059

0.0

48

0.161

0.0

88

8 0.1

640

‘4 0.3

12

0.285

0.0

70

0.058

0.1

97

0.112

10

0.190

0 %

6 0.3

62

0.333

0.0

81

0.068

0.2

36

0.132

12

0.216

0 %

0.4

12

0.380

0.0

92

0.078

0.2

60

0.148

l/4

0.250

0 ‘46

0.4

77

0.442

0.1

07

0.092

0.3

04

0.169

%6

0.312

5 ‘12

0.5

97

0.556

0.1

34

0.116

0.3

81

0.218

“/8

0.375

0 g/

6 0.7

17

0.670

0.1

61

0.140

0.4

53

0.266

‘/,c

0.437

5 “h

0.7

60

0.715

0.1

56

0.133

0.4

98

0.295

‘/>

0.500

0 “/a

0.8

15

0.765

0.1

56

0.130

0.5

48

0.328

0.029

0.032

0.034

0.050

0.0

38

0.032

0.0

19

0.172

0.062

0.0

50

0.034

0.0

20

0.196

0.071

0.0

59

0.036

0.0

21

0.220

0.039

0.045

0.048

.

. .

0.095

0.0

82

0.039

0.0

23

0.267

0.121

0.1

07

0.042

0.0

25

0.313

0.137

0.1

22

0.045

0.0

27

0.362

0.054

.

. .

0.066

0.077

0.083

0.090

0.167

0.1

50

0.050

0.0

29

0.424

0.218

0.1

98

0.057

0.0

34

0.539

0.266

0.2

44

0.065

0.0

39

0.653

0.296

0.2

73

0.073

0.0

44

0.690

0.329

0.3

05

0.081

0.0

49

0.739

GENE

RAL

NOTE

: Fo

r ad

dition

al re

quire

men

ts re

fer

to

para

. 2.

NOTE

S:

(1)

Whe

re sp

ecify

ing

nom

inal

size

in de

cimals

, ze

ros

prece

ding

decim

al an

d in

the

fourth

de

cimal

place

sh

all

be

omitte

d.

(2)

Scre

ws

of

these

len

gths

and

shor

ter

are

unde

rcut.

Scre

ws

of

longe

r len

gths

shall

ha

ve

head

he

ights

as

show

n in

Table

ID

. R

7

(3)

Point

sa

me

on

all

drive

rs.

(4)

No

tolera

nce

for

gagin

g dia

mete

r is

given

. If

the

gagin

g dia

mete

r of

the

ga

ge

used

dif

fers

from

tab

ulated

va

lue,

the

protru

sion

will

be

affec

ted

acco

rding

ly an

d the

2 m

prope

r pro

trusio

n va

lues

mus

t be

rec

alcula

ted

using

the

for

mula

s sh

own

in Ap

pend

ix I.

(5)

Not

prac

tical

to

gage

.


Q

/- Pr

otru

sion

gage

L-04

(s

ee

para

. 2.

2)

TABL

E 6A

D

IMEN

SIO

NS

OF

SLO

TTED

U

ND

ERC

UT

OVA

L C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S

Head

He

ad

Tota

l Pr

otru

sion

Abov

e

Nom

inal

Si

ze

Side

Head

He

ad

Slot

Sl

ot

Gagin

g Di

amete

r

or

Basic

Sc

rew

Leng

th

Diam

eter

Heigh

t Cr

own

Heigh

t W

idth

De

pth

F Ga

ging

Diam

eter

Diam

eter

[Not

: (Z

)]

A H,

Re

f. He

ight

0 J

T [N

ote

(411

G

[Not

e (1

)I

Max

. M

in.

[Note

(31

1 C,

Re

f. M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

[N

ote

(411

is

0 0.0

600

‘/8

0.112

0.

096

0.025

0.0

21

0.046

0.0

33

0.023

0.0

16

0.028

0.0

22

0.047

0.0

31

0.078

1 0.0

730

‘h

0.137

0.1

20

0.031

0.0

25

0.056

0.0

42

0.026

0.

019

0.034

0.0

27

0.053

0.0

35

0.10

1

2 0.0

860

I/,

0.162

0.1

44

0.036

0.

029

0.065

0.0

50

0.031

0.0

23

0.040

0.0

33

0.058

0.

039

0.124

3 0.

0990

l/B

0.1

87

0.167

0.0

42

0.033

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75

0.05

9 0.0

35

0.027

0.0

47

0.038

0.0

64

0.044

0.1

48

4 0.1

120

%6

0.212

0.

191

0.047

0.0

37

0.084

0.0

67

0.03

9 0.0

31

0.053

0.0

43

0.06

9 0.0

48

0.172

5

0.125

0 3/

16

0.237

0.2

15

0.053

0.0

41

0.09

4 0.0

76

0.043

0.0

35

0.05

9 0.0

48

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0.0

53

0.19

6 I

6 0.1

380

%6

0.262

0.2

38

0.05

9 0.0

45

0.104

0.0

84

0.048

0.

039

0.065

0.0

53

0.080

0.0

57

0.220

q 2 m

8

0.164

0 ‘4

0.3

12

0.285

0.0

70

0.052

0.1

23

0.10

1 0.0

54

0.045

0.0

78

0.064

0.

091

0.066

0.2

67

10

0.19

00

%6

0.362

0.3

33

0.081

0.0

60

0.142

0.1

18

0.060

0.0

50

0.09

0 0.0

74

0.102

0.0

75

0.313

K

12

0.216

0 7s

0.4

12

0.380

0.

092

0.068

0.1

61

0.135

0.0

67

0.056

0.1

03

0.085

0.1

13

0.084

0.3

62

ii s cn

‘/a

0.250

0 %

6 0.4

77

0.442

0.1

07

0.07

9 0.1

86

0.158

0.0

75

0.064

0.

119

0.09

8 0.

129

0.09

5 0.4

24

& 0.3

125

‘h

0.59

7 0.5

56

0.134

0.

099

0.232

0.

198

0.084

0.0

72

0.14

9 0.1

24

0.155

0.1

17

0.539

P

“/8

o 0.3

750

9/s

0.717

0.6

70

0.161

0.1

17

0.278

0.2

39

0.09

4 0.0

81

0.179

0.1

49

0.182

0.1

39

0.653

%6

0.437

5 78

0.7

60

0.715

0.1

56

0.122

0.2

79

0.239

0.

094

0.081

0.1

84

0.154

0.1

95

0.150

0.

690

5

‘/2

0.500

0 “4

0.8

15

0.765

0.1

56

0.131

0.2

88

0.244

0.1

06

0.09

1 0.2

04

0.169

0.2

12

0.163

0.7

39

9 2

GEN

ERAL

NO

TE:

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

m

NOTE

S:

t?

(1)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

. R

(2)

Scre

ws

of

thes

e le

ngth

s an

d sh

orte

r ar

e un

derc

ut.

Scre

ws

of

longe

r le

ngth

s sh

all

have

he

ad

heig

hts

as

show

n in

Ta

ble

4A.

d

(3)

Tabu

late

d va

lues

de

term

ined

from

fo

rmula

fo

r m

axim

um

H in

Ap

pend

ix A.

(4

) No

to

lera

nce

for

gagi

ng

diam

eter

is

giv

en.

If th

e ga

ging

dia

met

er

of

the

gage

us

ed

diffe

rs

from

ta

bula

ted

value

, th

e pr

otru

sion

will

be

affe

cted

ac

cord

ingl

y an

d th

e z

prop

er

prot

rusio

n va

lues

m

ust

be

reca

lcula

ted

usin

g th

e fo

rmul

as

show

n in

Ap

pend

ix I.

-J


This

typ

e of

re

cess

ha

s a

larg

e ce

nter

op

enin

g,

tape

red

wing

s,

and

blun

t bo

ttom

, wi

th

all

edge

s re

lieve

d or

ro

unde

d.

k -I

(see

pk

a.

2.2)

Prot

rusio

n ga

ge

be

TABL

E 6B

D

IMEN

SIO

NS

OF

TYPE

I

CR

OSS

R

ECES

SED

U

ND

ERC

UT

OVA

L C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Si

ze

Head

Re

cess

Pr

otru

sion

or

Basi

c He

ad

Side

He

ad

Tota

l Pe

netra

tion

Abov

e G

aging

G

aging

Sc

rew

Leng

th

Diam

eter

He

ight

Cr

own

Head

He

ight

Re

cess

Re

cess

Re

cess

G

aging

Di

amet

er

F Di

amet

er

Diam

eter

(N

ot:

(Z)]

Max

.

A H.

Re

f. He

ight

0

Diam

eter

De

pth

Wid

th

Drive

r De

pth

[Not

e (4

)) G

[Not

e (1

11

Min.

[N

ote

(311

C,

Re

f. M

ax.

Min.

M

. Re

f. T,

Ref

. N,

Re

f. Si

ze

Max

. M

in.

Max

. M

in.

[Not

e (4

11

cl

0 0.

0600

‘4

3 0.

112

0.09

6 0.

025

0.02

1 0.

046

0.03

3 0.

068

0.03

6 0.

014

0 0.

038

0.02

0 0.

047

0.03

1 0.

078

1 0.

0730

‘/B

0.

137

0.12

0 0.

031

0.02

5 0.

056

0.04

2 0.

070

0.03

9 0.

015

0 0.

041

0.02

3 0.

053

0.03

5 0.

101

2 0.

0860

‘1

s 0.

162

0.14

4 0.

036

0.02

9 0.

065

0.05

0 0.

106

0.06

0 0.

018

1 0.

062

0.04

5 0.

058

0.03

9 0.

124

3 0.

0990

‘/8

0.

187

0.16

7 0.

042

0.03

3 0.

075

0.05

9 0.

118

0.07

2 0.

019

1 0.

074

0.05

7 0.

064

0.04

4 0.

148

4 0.

1120

3/

s 0.

212

0.19

1 0.

047

0.03

7 0.

084

0.06

7 0.

130

0.08

6 0.

019

1 0.

087

0.07

0 0.

069

0.04

8 0.

172

5 0.

1250

%

6 0.

237

0.21

5 0.

053

0.04

1 0.

094

0.07

6 0.

152

0.07

3 0.

028

2 0.

074

0.05

0 0.

075

0.05

3 0.

196

6 0.

1380

%

6 0.

262

0.23

8 0.

059

0.04

5 0.

104

0.08

4 0.

172

0.09

2 0.

030

2 0.

094

0.06

9 0.

080

0.05

7 0.

220

8 0.

1640

‘/4

0.

312

0.28

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070

0.05

2 0.

123

0.10

1 0.

186

0.10

7 0.

031

2 0.

108

0.08

4 0.

091

0.06

6 0.

267

10

0.19

00

%5

0.36

2 0.

333

0.08

1 0.

060

0.14

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118

0.20

2 0.

125

0.03

3 2

0.12

6 0.

102

0.10

2 0.

075

0.31

3 12

0.

2160

%

0.

412

0.38

0 0.

092

0.06

8 0.

161

0.13

5 0.

264

0.14

0 0.

038

3 0.

135

0.11

1 0.

113

0.08

4 0.

362

‘/4

0.25

00

‘45

0.47

7 0.

442

0.10

7 0.

079

0.18

6 0.

158

0.28

4 0.

160

0.04

0 3

0.15

6 0.

131

0.12

9 0.

095

0.42

4 5/

,6

0.31

25

‘4

0.59

7 0.

556

0.13

4 0.

099

0.23

2 0.

198

0.37

4 0.

214

0.06

4 4

0.20

6 0.

182

0.15

5 0.

117

0.53

9 “/g

0.

3750

%

6 0.

717

0.67

0 0.

161

0.11

7 0.

278

0.23

9 0.

394

0.23

3 0.

066

4 0.

225

0.20

1 0.

182

0.13

9 0.

653

‘/6

0.43

75

7s

0.76

0 0.

715

0.15

6 0.

122

0.27

9 0.

239

0.40

4 0.

245

0.06

8 4

0.23

7 0.

213

0.19

5 0.

150

0.69

0 ‘/p

0.

5000

‘4

0.

815

0.76

5 0.

156

0.13

1 0.

288

0.24

4 0.

416

0.25

7 0.

070

4 0.

249

0.22

5 0.

212

0.16

3 0.

739

GEN

ERAL

NO

TE:

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

NOTE

S:

(1)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

. (2

) Sc

rews

of

th

ese

leng

ths

and

shor

ter

are

unde

rcut

, Sc

rews

of

lon

ger

leng

ths

shal

l ha

ve

head

he

ight

s as

sh

own

in

Tabl

e 48

. (3

) Ta

bula

ted

valu

es

dete

rmine

d fro

m

form

ula

for

max

imum

H

in

Appe

ndix

A.

(4)

No

tole

ranc

e fo

r ga

ging

dia

met

er

is

given

, If

the

gagi

ng

diam

eter

of

th

e ga

ge

used

di

ffers

fro

m

tabu

late

d va

lue,

the

prot

rusio

n w

ill be

af

fect

ed

acco

rdin

gly

and

the

prop

er

prot

rusio

n va

lues

m

ust

be

reca

lcula

ted

usin

g th

e fo

rmul

as

show

n in

Ap

pend

ix 1.


This

typ

e of

re

cess

ha

s a

larg

e ce

nter

op

enin

g,

wide

st

raig

ht

wing

s,

and

blun

t bo

ttom

, wi

th

all

edge

s re

lieve

d or

ro

unde

d.

I- 4

(see

pk

a.

2.2)

A-

Edge

of

he

ad

may

be

fla

t or

ro

unde

d

Prot

rusio

n ga

ge

TABL

E 6C

D

IMEN

SIO

NS

OF

TYPE

IA

CR

OSS

R

ECES

SED

U

ND

ERC

UT

OVA

L C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Si

ze

or

Basi

c Sc

rew

Diam

eter

Head

Re

cess

Pr

otru

sion

Head

Si

de

Head

To

tal

Pene

tratio

n Ab

ove

Gag

ing

Diam

eter

He

ad

Heig

ht

Gag

ing

Diam

eter

f

Gag

ing

Leng

th

Heig

ht

Crow

n Di

amet

er

L A

H.

Ref.

Heia

ht

0 Re

cess

Re

cess

Re

cess

Di

amet

er

Dept

h W

idth

Dr

iver

Dept

h [N

ote

(411

G

[Not

e (Il

l [N

ote

(2)]

Max

. M

in.

[N&e

(3

)] C,

Re

f. M

ax.

Min.

M

, Re

f. T,

Ref

. N,

Re

f. Si

ze

Max

. M

in.

Max

. M

in.

[Not

e (4

11

E 0

0.06

00

‘b

0.11

2 0.

096

0.02

5 0.

021

0.04

6 0.

033

0.06

8 0.

040

0.01

8 0

0.04

0 0.

024

0.04

7 0.

031

0.07

8 1

0.07

30

‘h

0.13

7 0.

120

0.03

1 0.

025

0.05

6 0.

042

0.07

0 0.

043

0.01

8 0

0.04

3 0.

027

0.05

3 0.

035

0.10

1 2

0.08

60

‘h

0.16

2 0.

144

0.03

6 0.

029

0.06

5 0.

050

0.10

6 0.

065

0.02

9 1

0.06

2 0.

046

0.05

8 0.

039

0.12

4 3

0.09

90

‘43

0.18

7 0.

167

0.04

2 0.

033

0.07

5 0.

059

0.11

8 0.

077

0.03

0 1

0.07

4 0.

058

0.06

4 0.

044

0.14

8

4 0.

1120

%

6 0.

212

0.19

1 0.

047

0.03

7 0.

084

0.06

7 0.

130

0.08

9 0.

030

1 0.

086

0.07

0 0.

069

0.04

8 0.

172

5 0.

1250

3/

s 0.

237

0.21

5 0.

053

0.04

1 0.

094

0.07

6 0.

152

0.08

0 0.

041

2 0.

074

0.05

6 0.

075

0.05

3 0.

196

5

6 0.

1380

34

6 0.

262

0.23

8 0.

059

0.04

5 0.

104

0.08

4 0.

172

0.10

0 0.

041

2 0.

093

0.07

5 0.

080

0.05

7 0.

220

2 zj m

8 0.

1640

‘1

4 0.

312

0.28

5 0.

070

0.05

2 0.

123

0.10

1 0.

186

0.11

5 0.

041

2 0.

108

0.09

0 0.

091

0.06

6 0.

267

10

0.19

00

5/16

0.

362

0.33

3 0.

081

0.06

0 0.

142

0.11

8 0.

202

0.13

2 0.

041

2 0.

125

0.10

7 0.

102

0.07

5 0.

313

Fi

12

0.21

60

“18

0.41

2 0.

380

0.09

2 0.

068

0.16

1 0.

135

0.26

4 0.

148

0.05

6 3

0.13

5 0.

117

0.11

3 0.

084

0.36

2 ii z 0-

l ‘A

, 0.

2500

%

6 0.

477

0.44

2 0.

107

0.07

9 0.

186

0.15

8 0.

284

0.16

8 0.

057

3 0.

155

0.13

7 0.

129

0.09

5 0.

424

5/6

0.31

25

%

0.59

7 0.

556

0.13

4 0.

099

0.23

2 0.

198

0.37

4 0.

223

0.08

6 4

0.20

5 0.

187

0.15

5 0.

117

0.53

9 “/8

0.

3750

9/

s 2

0.71

7 0.

670

0.16

1 0.

117

0.27

8 0.

239

0.39

4 0.

243

0.08

6 4

0.22

5 0.

207

0.18

2 0.

139

0.65

3 %

6 0.

4375

%

I z

0.76

0 0.

715

0.15

6 0.

122

0.27

9 0.

239

0.40

4 0.

253

0.08

6 4

0.23

5 0.

217

0.19

5 0.

150

0.69

0

‘/2

0.50

00

“14

0.81

5 0.

765

0.15

6 0.

131

0.28

8 0.

244

0.41

6 0.

265

0.08

6 4

0.24

7 0.

229

0.21

2 0.

163

0.73

9 5

GEN

ERAL

NO

TE:

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

FE

NOTE

S:

:: (1

) W

here

sp

ecify

ing

nom

inal

siz

e in

de

cimal

s,

zero

s pr

eced

ing

decim

al

and

in

the

four

th

decim

al

plac

e sh

all

be

omitt

ed.

A (2

) Sc

rews

of

th

ese

leng

ths

and

shor

ter

are

unde

rcut

. Sc

rews

of

lon

ger

leng

ths

shal

l ha

ve

head

he

ight

s as

sh

own

in

Tabl

e 4C

. s

(3)

Tabu

late

d va

lues

de

term

ined

from

fo

rmula

fo

r m

axim

um

H in

Ap

pend

ix A.

2

(4)

No

tole

ranc

e fo

r ga

ging

dia

met

er

is g

iven.

If

the

gagi

ng

diam

eter

of

th

e ga

ge

used

di

ffers

fro

m

tabu

late

d va

lue,

the

prot

rusio

n w

ill be

af

fect

ed

acco

rdin

gly

and

the

5 pr

oper

pr

otru

sion

valu

es

mus

t be

re

calcu

late

d us

ing

the

form

ulas

sh

own

in

Appe

ndix

I. W

J


c3s

+=I=

M

N

This

type

of

rece

ss

cons

ists

of

two

inter

secti

ng

slots

with

pa

rallel

sides

co

nver

ging

to

a sli

ghtly

tru

ncate

d ap

ex

at

botto

m

of

rece

ss.

(see

para

. 2.2

)

A-

Edge

of

he

ad

may

be

flat

or

round

ed

5 IO

z m

0”

2?

z cn

z : 5 z!

0)

2

TABL

E 6D

D

IMEN

SIO

NS

OF

TYPE

II

CR

OSS

R

ECES

SED

U

ND

ERC

UT

OVA

L C

OU

NTE

RSU

NK

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Si

ze

Head

He

ad

Tota

l Pr

otru

sion

Abov

e Di

amet

er

Side

He

ad

Head

He

ight

Re

cess

Pe

netra

tion

Gag

ing

Diam

eter

G

aging

or

Ba

sic

Scre

w Le

ngth

A

Heig

ht

Crow

n 0

Rece

ss

Rece

ss

Rece

ss

Drive

r G

aging

De

pth

F [N

ote

(5)]

Diam

eter

Diam

eter

L

H,

Ref.

Heig

ht

Diam

eter

De

pth

Wid

th

Size

G

[Not

e (1

)I

[Note

(2

)] M

ax.

Min.

[N

ote

(3)]

C,

Ref.

Max

. M

in.

M,

Ref.

T, R

ef.

N,

Ref.

[Not

e (4

)] M

ax.

Min.

M

ax.

Min.

[N

ote

Ml

z 0

0.06

00

1 0.0

730

2 0.0

860

3 0.0

990

4 0.1

120

5 0.1

250

6 0.1

380

8 0.1

640

IO

0.190

0

12

0.216

0

‘/d

0.250

0

5/16

0.312

5

‘/a

0.375

0

7/16

0.437

5

‘/2

0.500

0

l/B

0.112

0.0

96

0.025

0.0

21

0.046

0.0

33

0.067

0.0

29

0.020

‘43

0.137

0.1

20

0.031

0.0

25

0.056

0.0

42

0.082

0.0

39

0.022

.

.

‘h 0.1

62

0.144

0.0

36

0.029

0.0

65

0.050

0.1

00

0.050

0.0

25

‘h 0.1

87

0.167

0.0

42

0.033

0.0

75

0.059

0.1

11

0.058

0.0

26

3/16

0.212

0.1

91

0.047

0.0

37

0.084

0.0

67

0.129

0.0

70

0.029

3/16

0.237

0.2

15

0.053

0.0

41

0.094

0.0

76

0.147

0.0

80

0.032

.

.

%6

0.262

0.2

38

0.059

0.0

45

0.104

0.0

84

0.161

0.0

88

0.034

‘A

0.312

0.2

85

0.070

0.0

52

0.123

0.1

01

0.197

0.1

12

0.039

%6

0.362

0.3

33

0.081

0.0

60

0.142

0.1

18

0.236

0.1

32

0.045

.

23

0.412

0.3

80

0.092

0.0

68

0.161

0.1

35

0.260

0.1

4%

0.048

.

.

%6

0.477

0.4

42

0.107

0.0

79

0.186

0.1

58

0.304

0.1

69

0.054

‘h 0.5

97

0.556

0.1

34

0.099

0.2

32

0.198

0.3

8 1

0.218

0.0

66

g/16

0.7

17

0.670

0.1

61

0.117

0.2

78

0.239

0.4

53

0.266

0.0

77

%

0.760

0.7

15

0.156

0.1

22

0.279

0.2

39

0.498

0.2

95

0.083

.

%

0.815

0.7

65

0.156

0.1

31

0.288

0.2

44

0.548

0.3

28

0.090

Note

(6)

Note

(6)

Note

(6)

Note

(6)

0.030

0.0

20

0.038

0.0

27

0.050

0.0

38

0.062

0.0

50

0.071

0.0

59

0.095

0.0

82

0.121

0.1

07

0.137

0.1

22

0.167

0.1

50

0.218

0.1

98

0.266

0.2

44

0.296

0.2

73

0.329

0.3

05

0.047

0.0

31

0.053

0.0

35

0.058

0.0

39

0.064

0.0

44

0.069

0.0

48

0.075

0.0

53

0.080

0.0

57

0.091

0.0

66

0.102

0.0

75

0.113

0.0

84

0.129

0.0

95

0.155

0.1

17

0.182

0.1

39

0.195

0.1

50

0.212

0.1

63

0.078

0.101

0.124

0.148

0.172

0.196

0.220

0.267

0.313

0.362

0.424

0.539

0.653

0.690

0.739

GENE

RAL

NOTE

: Fo

r ad

dition

al re

quire

men

ts re

fer

to

para

. 2.

NOTE

S:

(1)

Whe

re sp

ecify

ing

nom

inal

size

in de

cimals

, ze

ros

prece

ding

decim

al an

d in

the

fourth

de

cimal

place

sh

all

be

omitte

d.

(2)

Scre

ws

of

these

len

gths

and

shor

ter

are

unde

rcut.

Scre

ws

of

longe

r len

qths

shall

ha

ve

head

he

ights

as

show

n in

Table

4D

. i3j

Ta

bulat

ed

value

s de

term

ined

from

for

mula

fo

r m

axim

um

H in

Appe

ndihA

. (4

) Po

int

sam

e on

all

dr

ivers.

(5

) No

tol

eranc

e fo

r ga

ging

diam

eter

is giv

en.

If the

ga

ging

diam

eter

of

the

gage

us

ed

differ

s fro

m

tabula

ted

value

, the

pro

trusio

n wi

ll be

aff

ected

ac

cord

ingly

and

the

prope

r pro

trusio

n va

lues

mus

t be

rec

alcula

ted

using

the

for

mula

s sh

own

in Ap

pend

ix I.

(6)

Not

prac

tical

to

gage

.


x

This

typ

e of

re

cess

ha

s a

larg

e ce

nter

op

enin

g,

tape

red

wing

s,

and

blun

t bo

ttom

, wi

th

all

edge

s re

lieve

d or

ro

unde

d.

Long

Sc

rews

W

ith

Redu

ced

Body

an

d Sh

ould

er

TABL

E 7A

IL

LUST

RAT

ION


,.,

s LA

TABL

E 7A

D

IMEN

SIO

NS

OF

TYPE

I

CR

OSS

R

ECES

SED

FL

AT

CO

UN

TER

SUN

K TR

IM

HEA

D

MAC

HIN

E SC

REW

S 5

Nom

inal

Size

or

Pr

otru

sion

:

Basi

c Sh

ould

er

Head

He

ad

Rece

ss

Abov

e G

aging

Scre

w Di

amet

er

Diam

eter

G

aging

Re

cess

Re

cess

Re

cess

Pe

netra

tion

Diam

eter

F

5

Diam

eter

He

ad

E A

Heig

ht

Diam

eter

2

H,

Ref.

Diam

eter

De

pth

Wid

th

Drive

r G

aging

De

pth

[Not

e (4

)l G

m

[Not

e (2

11

Size

M

ax.

Min.

M

ax.

Min.

[N

ote

(311

M

, Re

f. T,

Ref

. N,

Re

f. Si

ze

Max

. M

in.

Max

. M

in.

[Not

e (4

11

$

4 0.1

120

5 0.1

250

6 0.1

380

6 0.1

380

0.112

0.1

06

0.187

0.1

67

0.052

0.

100

0.060

0.0

18

0.125

0.1

19

0.212

0.1

91

0.060

0.1

22

0.081

0.0

18

0.138

0.1

31

0.212

0.1

91

0.052

0.1

22

0.081

0.0

18

0.138

0.1

31

0.237

0.2

15

0.068

0.1

48

0.074

0.0

27

0.061

0.0

45

0.031

0.0

18

0.148

0.082

0.0

66

0.032

0.0

19

0.172

0.082

0.0

66

0.032

0.0

19

0.172

0.075

0.0

52

0.034

0.0

20

0.196

8 0.1

640

5 0.1

64

0.157

0.2

37

0.215

0.0

52

0.158

0.0

84

0.02

9

8 0.1

640

6 0.1

64

0.157

0.2

62

0.238

0.0

69

0.176

0.1

02

0.030

10

0.190

0 8

0.190

0.1

81

0.312

0.2

85

0.085

0.1

82

0.110

0.0

30

z;’

12

0.216

0 8

0.216

0.2

07

0.312

0.2

85

0.069

0.1

92

0.120

0.0

32

12

0.216

0 10

0.2

16

0.207

0.3

62

0.333

0.1

01

0.198

0.1

24

0.032

l/4

0.250

0 10

0.2

50

0.240

0.3

62

0.333

0.0

80

0.19

8 0.1

24

0.032

& 0.2

500

12

0.250

0.2

40

0.412

0.3

80

0.112

0.2

62

0.144

0.0

35

%6

0.312

5 12

0.3

12

0.302

0.4

12

0.380

0.0

75

0.262

0.1

44

0.035

5/6

0.312

5 ‘4

0.312

0.3

02

0.477

0.4

42

0.116

0.2

76

0.160

0.0

36

‘/,

0.375

0 %

6 0.3

75

0.364

0.5

97

0.556

0.1

55

0.358

0.2

05

0.061

0.085

0.0

62

0.034

0.0

20

0.19

6 0.1

03

0.080

0.0

36

0.021

0.2

20

0.110

0.0

87

0.039

0.0

23

0.267

0.120

0.0

97

0.039

0.0

23

0.267

0.125

0.1

02

0.042

0.0

25

0.313

0.125

0.1

02

0.042

0.0

25

0.313

0.139

0.1

16

0.045

0.0

27

0.362

0.139

0.1

16

0.045

0.0

27

0.362

0.154

0.1

31

0.050

0.0

29

0.424

0.196

0.1

74

0.057

0.0

34

0.539

GENE

RAL

NOTE

S:

(a)

For

addit

ional

requ

irem

ents

refer

to

pa

ra.

2.

(b)

For

refer

ence

, se

e Ta

ble

7A

Illustr

ation

on

pre

vious

pa

ge.

NOTE

S:

(1)

Shor

t sc

rews

inc

lude

nom

inal

length

s up

to

an

d inc

luding

l’/a

in.

fo

r siz

es

No.

5 an

d sm

aller

, an

d 2

in.

for

sizes

No

. 6

and

large

r, (2

) W

here

spec

ifying

no

mina

l siz

e in

decim

als.

zeros

pre

cedin

g de

cimal

and

in the

fou

rth

decim

al pla

ce

shall

be

om

itted.

(3

) Ta

bulat

ed

value

s de

term

ined

from

for

mula

fo

r m

axim

um

H in

Appe

ndix

A.

(4)

No

tolera

nce

for

gagin

g dia

mete

r is

given

. If

the

gagin

g dia

mete

r of

the

ga

ge

used

dif

fers

from

tab

ulated

va

lue,

the

protru

sion

will

be

affec

ted

acco

rding

ly an

d the

pro

per

protru

sion

value

s m

ust

be

recalc

ulated

us

ing

the

form

ulas

show

n in

Appe

ndix

I.

R 2 a co

in w

I,


This

typ

e of

re

cess

ha

s a

larg

e ce

nter

op

enin

g,

wide

st

raig

ht

wing

s,

and

blun

t bo

ttom

, wi

th

all

edge

s re

lieve

d or

ro

unde

d.

A m

in.

I- Ed

ge

of

head

m

ay

be

flat

or

roun

ded

)/d,,b

[N

ote(

l)1

1

+---I

a I

LPro

trusio

n ga

ge

-4--

0.06

2 m

in.

TAB

LE

78

ILLU

ST

RA

TIO

N

Long

Sc

rews

W

ith

Redu

ced

Body

an

d Sh

ould

er


TABL

E 7B

D

IMEN

SIO

NS

OF

TYPE

IA

CR

OSS

R

ECES

SED

FL

AT

CO

UN

TER

SUN

K TR

IM

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Size

or

Protr

usion

Basic

Sh

oulde

r He

ad

Head

Re

cess

Ab

ove

Gagin

g

Scre

w Di

amete

r Di

amete

r

E A

Heigh

t Re

cess

Re

cess

Re

cess

Pe

netra

tion

Diam

eter

f

Diam

eter

Head

H,

Re

f. Di

amete

r De

pth

Widt

h Dr

iver

Gagin

g De

pth

[Note

(4

11

[Note

(21

1 Siz

e M

ax.

Min.

M

ax.

Min.

[N

ote

(311

M

. Re

f. T,

kef

. N,

Re

f. Siz

e M

ax.

Min.

M

ax.

Min.

4 0.

1120

3

0.11

2 0.

106

0.18

7 0.

167

0.05

2 0.

100

0.06

0 0.

029

1 0.

058

0.04

2 0.

031

0.01

8 5

0.12

50

4 0.

125

0.11

9 0.

212

0.19

1 0.

060

0.12

2 0.

081

0.03

0 I

0.07

9 0.

063

0.03

2 0.

019

6 0.

1380

4

0.13

8 0.

131

0.21

2 0.

191

0.05

2 0.

122

0.08

1 0.

030

1 0.

079

0.06

3 0.

032

0.01

9 6

0.13

80

5 0.

138

0.13

1 0.

237

0.21

5 0.

068

0.14

8 0.

077

0.04

1 2

0.07

1 0.

053

0.03

4 0.

020

Gagin

g

Diam

eter G

[Not

e (4

11

0.14

8 0.

172

0.17

2

0.19

6

8 0.

1640

5

0.16

4 0.

157

0.23

7 0.

215

0.05

2 0.

158

0.08

8 0.

041

2 0.

081

0.06

3 0.

034

0.02

0 0.

196

8 0.

1640

6

0.16

4 0.

157

0.26

2 0.

238

0.06

9 0.

176

0.10

5 0.

041

2 0.

099

0.08

1 0.

036

0.02

1 0.

220

IO

0.19

00

a 0.

190

0.18

1 0.

312

0.28

5 0.

085

0.18

2 0.

112

0.04

1 2

0.10

7 0.

089

0.03

9 0.

023

0.26

7 %

12

0.

2160

a

0.21

6 0.

207

0.31

2 0.

285

0.06

9 0.

192

0.12

2 0.

041

2 0.

117

0.09

9 0.

039

0.02

3 0.

267

12

0.21

60

10

0.21

6 0.

207

0.36

2 0.

333

0.10

1 0.

198

0.12

7 0.

041

2 0.

122

0.10

4 0.

042

0.02

5 0.

313

‘/4

0.25

00

10

0.25

0 0.

240

0.36

2 0.

333

0.08

0 0.

198

0.12

7 0.

041

2 0.

122

0.10

4 0.

042

0.02

5 0.

313

‘/4

0.25

00

I2

0.25

0 0.

240

0.41

2 0.

380

0.11

2 0.

262

0.14

9 0.

056

3 0.

136

0.11

8 0.

045

0.02

7 0.

362

5/,6

0.

3125

12

0.

312

0.30

2 0.

412

0.38

0 0.

075

0.26

2 0.

149

0.05

6 3

0.13

6 0.

118

0.04

5 0.

027

0.36

2 5/

,6

0.31

25

‘4

0.31

2 0.

302

0.47

7 0.

442

0.11

6 0.

276

0.16

4 0.

057

3 0.

151

0.13

3 0.

050

0.02

9 0.

424

?k

0.37

50

5/16

0.

375

0.36

4 0.

597

0.55

6 0.

155

0.35

8 0.

211

0.08

6 4

0.19

3 0.

175

0.05

7 0.

034

0.53

9

GEN

ERAL

NO

TES:

(a

) Fo

r ad

ditio

nal

requ

irem

ents

refe

r to

pa

ra.

2.

(b)

For

refe

renc

e,

see

Tabl

e 78

Illu

stra

tion

on

prev

ious

page

.

NOTE

S:

(1)

Shor

t sc

rews

in

clude

no

min

al

leng

ths

up

to

and

inclu

ding

I’/

s in

. fo

r siz

es

No.

5 an

d sm

alle

r, an

d 2

in.

for

sizes

No

. 6

and

large

r. (2

) W

here

sp

ecify

ing

nom

inal

siz

e in

de

cimal

s,

zero

s pr

eced

ing

decim

al

and

in

the

four

th

decim

al

plac

e sh

all

be

omitt

ed.

(3)

Tabu

late

d va

lues

de

term

ined

from

fo

rmula

fo

r m

axim

um

H in

Ap

pend

ix A.

(4

) No

to

lera

nce

for

gagi

ng

diam

eter

is

give

n.

If th

e ga

ging

dia

met

er

of

the

gage

us

ed

diffe

rs

from

ta

bula

ted

value

, th

e pr

otru

sion

will

be

affe

cted

ac

cord

ingl

y an

d th

e pr

oper

pr

otru

sion

valu

es

mus

t be

re

calcu

late

d us

ing

the

form

ulas

sh

own

in

Appe

ndix

I.


This

typ

e of

re

cess

co

nsis

ts

of

two

inte

rsec

ting

slot

s wi

th

para

llel

side

s co

nver

ging

to

a sli

ghtly

tru

ncat

ed

apex

at

bo

ttom

of

re

cess

.

Prot

rusio

n ga

ge

Long

Sc

rews

W

ith

Redu

ced

Body

an

d Sh

ould

er

TABL

E 7C

IL

LUST

RATI

ON


TABL

E 7C

D

IMEN

SIO

NS

OF

TYPE

II

CR

OSS

R

ECES

SED

FL

AT

CO

UN

TER

SUN

K TR

IM

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Pr

otru

sion

Size

or

Ba

sic

Shou

lder

He

ad

Head

Re

cess

Ab

ove

Gag

ing

Pene

tratio

n Di

amet

er

F G

aging

Scre

w Di

amet

er

Diam

eter

He

ight

Re

cess

Re

cess

Re

cess

Dr

iver

Diam

eter

Diam

eter

He

ad

E A

H,

Ref.

Diam

eter

De

pth

Wid

th

Size

G

aging

De

pth

INot

e (5

J1

G

[Not

e (2

11

Size

M

ax.

Min.

M

ax.

Min.

[N

ote

(311

M,

Ref.

T, R

ef.

N.

Ref.

[Not

e (41

1 M

ax.

Min.

M

ax.

Min.

[N

ote

(5Jl

4 0.1

120

3 0.1

12

0.106

0.1

87

0.167

0.0

52

0.133

0.0

72

0.030

0.0

53

0.041

0.0

31

0.018

0.1

48

5 0.1

250

4 0.1

25

0.119

0.2

12

0.191

0.0

60

0.151

0.0

82

0.032

.

0.064

0.0

52

0.032

0.0

19

0.172

6

0.138

0 4

0.138

0.1

31

0.212

0.1

91

0.052

0.1

51

0.082

0.0

32

0.064

0.0

52

0.032

0.0

19

0.172

6

0.138

0 5

0.138

0.1

31

0.237

0.2

15

0.068

0.1

69

0.094

0.0

35

0.077

0.0

64

0.034

0.0

20

0.196

8 0.1

640

5 0.1

64

0.157

0.2

37

0.215

0.0

52

0.169

0.0

94

0.035

.

. .

0.077

0.0

64

0.034

0.0

20

0.196

8

0.164

0 6

0.164

0.1

57

0.262

0.2

38

0.069

0.1

88

0.106

0.0

38

. 0.0

89

0.075

0.0

36

0.021

0.2

20

10

0.190

0 8

0.190

0.1

81

0.312

0.2

85

0.085

0.2

24

0.124

0.0

43

. .

. 0.1

13

0.099

0.0

39

0.023

0.2

67

P 12

0.2

160

8 0.2

16

0.207

0.3

12

0.285

0.0

69

0.224

0.1

24

0.043

.

. 0.1

13

0.099

0.0

39

0.023

0.2

67

12

0.216

0 IO

0.2

16

0.207

0.3

62

0.333

0.1

01

0.260

0.1

48

0.048

.

. .

0.137

0.1

22

0.042

0.0

25

0.313

‘/4

0.250

0 10

0.2

50

0.240

0.3

62

0.333

0.0

80

0.260

0.1

48

0.048

,

, 0.1

37

0.122

0.0

42

0.025

0.3

13

‘/4

0.250

0 12

0.2

50

0.240

0.4

12

0.380

0.1

12

0.297

0.1

72

0.054

0.1

62

0.145

0.0

45

0.027

0.3

62

5/S

0.312

5 12

0.3

12

0.302

0.4

12

0.380

0.0

75

0.297

0.1

72

0.054

.

. .

0.162

0.1

45

0.045

0.0

27

0.362

5/

,6

0.312

5 ‘/,

0.3

12

0.302

0.4

77

0.442

0.1

16

0.344

0.1

95

0.061

.

. .

0.193

0.1

76

0.050

0.0

29

0.424

“/8

0.3

750

5/16

0.375

0.3

64

0.597

0.5

56

0.155

0.4

32

0.252

0.0

74

0.251

0.2

32

0.057

0.0

34

0.539

GENE

RAL

NOTE

S:

(a)

For

addit

ional

requ

irem

ents

refer

to

pa

ra.

2.

(b)

For

refer

ence

, se

e Ta

ble

7C

Illustr

ation

on

pre

vious

pa

ge.

NOTE

S:

(1)

Shor

t sc

rews

inc

lude

nom

inal

length

s up

to

an

d inc

luding

lr/a

in.

fo

r siz

es

No.

5 an

d sm

aller

, an

d 2

in.

for

sizes

No

. 6

and

large

r. (2

) W

here

spec

ifying

no

mina

l siz

e in

decim

als,

zeros

pre

cedin

g de

cimal

and

in the

fou

rth

decim

al pla

ce

shall

be

om

itted.

(3

) Ta

bulat

ed

value

s de

term

ined

from

for

mula

fo

r m

axim

um

H in

Appe

ndix

A.

(4)

Point

sa

me

on

all

drive

rs.

(5)

No

tolera

nce

for

gagin

g dia

mete

r is

given

. If

the

gagin

g dia

mete

r of

the

ga

ge

used

dif

fers

from

tab

ulated

va

lue,

the

protru

sion

will

be

affec

ted

acco

rding

ly an

d the

pro

per

protru

sion

value

s m

ust

be

recalc

ulated

us

ing

the

form

ulas

show

n in

Appe

ndix

I.


Thist

ype

of

rece

ss

has

a la

rge

cent

er

open

ing,ta

pere

d wi

ngs,

an

d bl

untb

otto

m,w

ith

all

edge

s re

lieve

d or

ro

unde

d.

a 8

Shor

t Sc

rews

It- 0.

062

min

. Long

Sc

rews

W

ith

Redu

ced

Body

an

d Sh

ould

er

TABL

E 8A

D

IMEN

SIO

NS

OF

TYPE

I

CR

OSS

R

ECES

SED

O

VAL

CO

UN

TER

SUN

K TR

IM

HEA

D

MAC

HIN

E SC

REW

S -

Nom

inal

Si

ze

Shou

lder

He

ad

Head

To

tal

Rece

ss

Prot

rusio

n z

or

Basi

c Si

de

Head

He

ad

Pene

tratio

n Ab

ove

Gag

ing

( 2

Scre

w Di

amet

er

Diam

eter

G

aging

Di

amet

er

f Za

ging

Di

5

Diam

eter

He

ad

E A

Heig

ht

Crow

n He

ight

He

ad

Rece

ss

Rece

ss

Rece

ss

iamet

er

m

H,

Ref.

Heig

ht

0,

Ref.

Radi

us

Diam

eter

De

pth

Wid

th

Drive

r De

pth

[Not

e ‘-”

!

i311

G

v, [N

ote

WI

Size

M

ax.

Min.

M

ax.

Min.

[N

ote

(311

C,

Re

f. [N

ote

(411

R,

Re

f. M

, Re

f. T,

Ref

. N,

Re

f. Si

ze

Max

. M

in.

Max

. M

in.

[Not

e (5

)] q

For

Shor

t Sc

rews

[N

ote

(111

4 0.

1120

3

0.18

7 0.

167

0.05

7 5

0.12

50

4 .

. 0.

212

0.19

1 0.

066

6 0.

1380

4

. .

. .

. 0.

212

0.19

1 0.

058

6 0.

1380

5

. .

. 0.

237

0.21

5 0.

075

8 0.

1640

5

. . .

.

0.23

7 0.

215

0.06

0 8

0.16

40

6 .

. .

. .

. 0.

262

0.23

8 0.

076

10

0.19

00

8 .

0.31

2 0.

285

0.09

4 12

0.

2160

a

. .

. 0.

312

0.28

5 0.

078

12

0.21

60

10

. .

. .

. .

0.36

2 0.

333

0.11

1

0.03

3 0.

037

0.03

7

0.04

1

0.04

1 0.

045

0.07

6 0.

076

0.06

0

0.08

6 0.

014

0.11

8 0.

072

0.01

9 1

0.07

4 0.

057

0.06

4 0.

044

0.14

8 5

0.09

9 0.

017

0.13

0 0.

086

0.01

9 1

0.08

7 0.

070

0.06

9 0.

048

0.17

2 c'

0.09

1 0.

017

0.13

0 0.

086

0.01

9 1

0.08

7 0.

070

0.06

9 0.

048

0.17

2 5

0.11

2 0.

019

0.15

2 0.

073

0.02

8 2

0.07

4 0.

050

0.07

5 0.

053

0.19

6 2

0.09

6 0.

019

0.15

2 0.

073

0.02

8 2

0.07

4 0.

050

0.07

5 0.

053

0.19

6 z

0.11

7 0.

021

0.17

2 0.

092

0.03

0 2

0.09

4 0.

069

0.08

0 0.

057

0.22

0 g

0.14

1 0.

025

0.18

6 0.

107

0.03

1 2

0.10

8 0.

084

0.09

1 0.

066

0.26

7 R

0.12

5 0.

025

0.18

6 0.

107

0.03

1 2

0.10

8 0.

084

0.09

1 0.

066

0.26

7 z

0.16

6 0.

029

0.20

2 0.

125

0.03

3 2

0.12

6 0.

102

0.10

2 0.

075

0.31

3 E

(con

tinue

d)

ii


3 F 6 5 TA

BLE

8A

DIM

ENSI

ON

S O

F TY

PE

I C

RO

SS

REC

ESSE

D

OVA

L C

OU

NTE

RSU

NK

TRIM

H

EAD

M

ACH

INE

SCR

EWS

(CO

NT’

D)

vl

Head

To

tal

Rece

ss

Protr

usion

usion

Fz

Fz

No

mina

l Siz

e Sh

oulde

r He

ad

Pene

tratio

n Ab

ove

Gagin

g Ga

ging

P.--:

-- 2 2

or

Basic

Sid

e He

ad

Head

Ga

ging

O-J

c/-J

Scre

w Di

amete

r Di

amete

r He

ight

Crow

n He

ight

Head

Re

cess

Re

cess

Re

cess

Ga

ging

Diam

eter

F Di

amete

r -.

I...

-_-.

P P Di

amete

r He

ad

E A

H,

Ref.

Heigh

t 0,

Re

f. Ra

dius

Diam

eter

Depth

W

idth

Drive

r De

pth

[Note

(5

11

? (5

11

G

G

Q

Q

(Note

(2

11

Size

Max

. M

in.

Max

. M

in.

[Note

(3

)] C,

Re

f. [N

ote

(411

R,

Ref.

M,

Ref.

T.

Ref.

N,

Ref.

Size

Max

. M

in.

Max

. M

in.

[Note

(51

1 5 r-7

Fo

r Sh

ort

Scre

ws

[Note

(11

1 (C

ont’d

) . ,

I z

0.313

m

0.362

:

0.362

:

0.424

g

0.539

E 2

'/4

0.250

0 10

0.3

62

0.333

'/4

0.250

0 12

.

. .

0.412

0.3

80

5/,6

0.3

125

12

0.412

0.3

80

5/,5

0.3

125

'/4

. .

. .

. 0.4

77

0.442

"/8

0.3

750

%$j

. .

0.597

0.5

56

For

Long

Sc

rews

W

ith

Shou

lder

4 0.1

120

3 0.1

12

0.106

0.1

87

0.167

5

0.125

0 4

0.125

0.1

19

0.212

0.1

91

6 0.1

380

4 0.1

38

0.131

0.2

12

0.191

6

0.138

0 5

0.138

0.1

31

0.237

0.2

15

8 0.1

640

5 0.1

64

0.157

0.2

37

0.215

8 0.1

640

6 0.1

64

0.157

0.2

62

0.238

IO

0.190

0 8

0.190

0.1

81

0.312

0.2

85

12

0.216

0 8

0.216

0.2

07

0.312

0.2

85

12

0.216

0 10

0.2

16

0.207

0.3

62

0.333

'/4

0.250

0 10

0.2

50

0.240

0.3

62

0.333

0.0

91

0.060

0.1

46

0.029

0.2

14

0.136

0.0

33

'/4

0.250

0 12

0.2

50

0.240

0.4

12

0.380

0.1

24

0.068

0.1

87

0.033

0.2

64

0.140

0.0

38

%6

0.312

5 12

0.3

12

0.302

0.4

12

0.380

0.0

87

0.068

0.1

50

0.033

0.2

64

0.140

0.0

38

5/16

0.312

5 'Ai

0.3

12

0.302

0.4

77

0.442

0.1

30

0.079

0.2

02

0.038

0.2

84

0.160

0.0

40

"/a

0.375

0 5&

j 0.3

75

0.364

0.5

97

0.556

0.1

73

0.099

0.2

65

0.048

0.3

84

0.226

0.0

65

0.091

0.0

60

0.146

0.0

29

0.202

0.1

25

0.033

0.124

0.0

68

0.187

0.0

33

0.264

0.1

40

0.038

0.087

0.0

68

0.150

0.0

33

0.264

0.1

40

0.038

0.130

0.0

79

0.202

0.0

38

0.284

0.1

60

0.040

0.173

0.0

99

0.265

0.0

48

0.384

0.2

26

0.065

0.057

0.0

33

0.086

0.0

14

0.118

0.0

72

0.019

0.066

0.0

37

0.099

0.0

17

0.130

0.0

86

0.019

0.058

0.0

37

0.091

0.0

17

0.130

0.0

86

0.019

0.075

0.0

41

0.112

0.0

19

0.162

0.0

84

0.028

0.060

0.0

41

0.096

0.0

19

0.162

0.0

84

0.028

0.076

0.0

45

0.117

0.0

21

0.188

0.1

08

0.031

0.094

0.0

76

0.141

0.0

25

0.200

0.1

22

0.031

0.078

0.0

76

0.125

0.0

25

0.200

0.1

22

0.031

0.111

0.0

60

0.166

0.0

29

0.214

0.1

36

0.033

2 3 3 3 4 1 1 1 2 2 2 2 2 2 2 3 3 3 4

0.126

0.1

02

0.102

0.0

75

0.135

0.1

11

0.113

0.0

84

0.135

0.1

11

0.113

0.0

84

0.156

0.1

31

0.129

0.0

95

0.218

0.1

94

0.155

0.1

17

0.074

0.0

57

0.064

0.0

44

0.148

0.087

0.0

70

0.069

0.0

48

0.172

0.087

0.0

70

0.069

0.0

48

0.172

0.085

0.0

61

0.075

0.0

53

0.196

0.085

0.0

61

0.075

0.0

53

0.196

0.110

0.0

85

0.080

0.0

57

0.220

0.1

24

0.099

0.0

91

0.066

0.2

67

0.124

0.0

99

0.091

0.0

66

0.267

0.137

0.1

12

0.102

0.0

75

0.313

0.137

0.1

12

0.102

0.0

75

0.135

0.1

11

0.113

0.0

84

0.135

0.1

11

0.113

0.0

84

0.156

0.1

31

0.129

0.0

95

0.313

0.362

0.362

0.424

0.539

0.2

18

0.194

0.1

55

0.117

GENE

RAL

NOTE

: Fo

r ad

dition

al re

quire

men

ts re

fer

to

para

. 2.

NOTE

S:

(1)

Shor

t sc

rews

inc

lude

nom

inal

length

s up

to

an

d inc

luding

I'&

in.

fo

r siz

es

No.

5 an

d sm

aller

, an

d 2

in.

for

sizes

No

, 6

and

large

r. (2

) W

here

spec

ifying

no

mina

l siz

e in

decim

als,ze

ros

prece

ding

decim

al an

d in

the

fourth

de

cimal

place

sh

all

be

omitte

d.

(3)

Tabu

lated

va

lues

deter

mine

d fro

m

form

ula

for

max

imum

Hin

Ap

pend

ix A.

E;

(4)

Tabu

lated

va

lues

deter

mine

d fro

m

form

ula

for

max

imum

Oi

n Ap

pend

ix A.

3

(5)

No

tolera

nce

for

gagin

g dia

mete

r is

given

. If

the

gagin

g dia

mete

r of

the

ga

ge

used

dif

fers

from

tab

ulated

va

lue,

the

protru

sion

will

be

affec

ted

acco

rding

ly an

d the

E

prope

r pro

trusio

n va

lues

mus

t be

rec

alcula

ted

using

the

for

mula

s sh

own

in Ap

pend

ix I.

a,

F w

I,


dor

round

ed.

(see

para

.2.2)

0.062

m

in. Lo

ng

Scre

ws

With

Re

duce

d Bo

dy

and

Shou

lder

TABL

E 8B

D

IMEN

SIO

NS

OF

TYPE

IA

CR

OSS

R

ECES

SED

O

VAL

CO

UN

TER

SUN

K TR

IM

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Si

ze

Head

To

tal

Rece

ss

Prot

rusio

n I

or

Basi

c Sh

ould

er

Head

Di

amet

er

Side

He

ad

Head

Pe

netra

tion

Abov

e G

aging

Scre

w Di

amet

er

Heig

ht

Crow

n He

ight

He

ad

Rece

ss

Rece

ss

Rece

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ing

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eter

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ht

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us

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e (5

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ote

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v)

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i

(con

tim

ed)


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I z TA

BLE

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DIM

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IA C

RO

SS

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ESSE

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OVA

L C

OU

NTE

RSU

NK

TRIM

H

EAD

M

ACH

INE

SCR

EWS

(CO

NT’

D)

m

v,

Nom

inal

Size

Head

To

tal

Rece

ss

Protr

usion

;;;

or

Basic

Sh

oulde

r He

ad

Diam

eter

Diam

eter

Side

Head

He

ad

Pene

tratio

n Ab

ove

Gagin

g Ga

ging

5

Scre

w Ga

ging

Diam

eter

F

Diam

eter

Head

E

A He

ight

Crow

n He

ight

Head

Re

cess

Re

cess

Re

cess

Di

amete

r H,

Re

f. He

ight

0.

Ref.

Radiu

s Di

amete

r De

pth

Widt

h Dr

iver

Depth

[N

ote

(5)l

is

G 0

[Not

e (2

11

Size

Max

. M

in.

Max

. M

in.

[Note

(3

)] C,

Re

f. [N

ote

(411

R,

Ref.

M,

Ref.

K Re

f. N,

Re

f. Siz

e M

ax.

Min.

M

ax.

Min.

[N

ote

WI

T

For

Shor

t Sc

rews

[N

ote

(l)]

(Con

t’d)

1/e

0.25

00

10

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362

0.33

3 0.

091

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0.25

00

12

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412

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124

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25

12

. .

. .

. 0.

412

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0 0.

087

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0.

3125

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0.

477

0.44

2 0.

130

"/,

0.37

50

7,s

.,.

. .

. 0.

597

0.55

6 0.

173

For

Long

Sc

rews

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ith

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lder

4 0.

1120

5

0.12

50

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1380

6

0.13

80

0.11

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106

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119

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191

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131

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191

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075

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118

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099

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00

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6

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079

0.20

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0.05

7

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50

5/s

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364

0.59

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556

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041

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187

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264

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202

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284

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057

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265

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384

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086

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044

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069

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172

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070

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048

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084

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075

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196

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066

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053

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109

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220

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104

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066

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122

0.10

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091

0.06

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3

0.13

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118

0.10

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075

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113

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362

0.13

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117

0.11

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084

0.36

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155

0.13

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129

0.09

5 0.

424

0.21

5 0.

197

0.15

5 0.

117

0.53

9

h I z 0.

313

m

0.36

2 0"

0.

362

g 0.

424

z 0.

539

g 2

GEN

ERAL

NO

TE:

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

NOTE

S:

(1)

Shor

t sc

rews

in

clude

no

min

al

leng

ths

up

to

and

inclu

ding

l'/a

in

. fo

r siz

es

No.

5 an

d sm

alle

r, an

d 2

in.

for

sizes

No

. 6

and

large

r. (2

) W

here

sp

ecify

ing

nom

inal

siz

e in

de

cimal

s,ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

. (3

) Ta

bula

ted

valu

es

dete

rmine

d fro

m

form

ula

for

max

imum

H

in

Appe

ndix

A.

R (4

) Ta

bula

ted

valu

es

dete

rmine

d fro

m

form

ula

for

max

imum

O

in Ap

pend

ix A.

(5

) No

to

lera

nce

for

gagi

ng

diam

eter

is

give

n.

If th

e ga

ging

dia

met

er

of

the

gage

us

ed

diffe

rs

from

ta

bula

ted

value

, th

e pr

otru

sion

will

be

affe

cted

ac

cord

ingl

y an

d th

e 2

prop

er

prot

rusio

n va

lues

m

ust

be

reca

lcula

ted

usin

g th

e fo

rmul

as

show

n in

Ap

pend

ix I.

m

6i

b,

b


This

typ

e of

re

cess

co

nsis

ts

of

two

inte

rsec

ting

slot

s wi

th

para

llel

side

s co

nver

ging

to

a sli

ghtly

tru

ncat

ed

apex

at

bo

ttom

of

re

cess

.

. “jk=

z =a

(s

ee

paya

. 2.

2)

lt-

0.06

2 m

in. Lo

ng

Scre

ws

With

Re

duce

d Bo

dy

and

Shou

lder

TABL

E 8C

IL

LUST

RAT

ION


TABL

E 8C

D

IMEN

SIO

NS

OF

TYPE

II

CR

OSS

R

ECES

SED

O

VAL

CO

UN

TER

SUN

K TR

IM

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Protr

usion

Size

or

Head

To

tal

Rece

ss

Abov

e

Basic

Sh

oulde

r He

ad

Side

Head

He

ad

Pene

tratio

n Ga

ging

Scre

w Di

amete

r Di

amete

r He

ight

Crow

n E

A He

ight

Head

Re

cess

Re

cess

Re

cess

Dr

iver

Gagin

g Di

amete

r F

D~~~

~t~r

Diam

eter

Head

H,

Re

f. He

ight

0,

Ref.

Radiu

s Di

amete

r De

pth

Widt

h Siz

e De

pth

[Note

16

11

G

[Note

(2

)1

Size

Max

. M

in.

Max

. M

in.

[Note

(3

)] C,

Re

f. [N

ote

14)l

R,

Ref.

M,

Ref.

T,

Ref.

A/,

Ref.

[Note

(51

1 M

ax.

Min.

M

ax.

Min.

[N

ote

(6)l

4 0.1

120

3 0.1

12

0.106

0.1

87

0.167

0.0

57

0.033

0.0

86

0.014

0.1

33

0.072

0.0

30

. 0.0

53

0.041

0.0

64

0.044

0.1

48

5 0.1

250

4 0.1

25

0.119

0.2

12

0.191

0.0

66

0.037

0.0

99

0.017

0.1

51

0.082

0.0

32

0.064

0.0

52

0.069

0.0

48

0.172

6

0.138

0 4

0.138

0.1

31

0.212

0.1

91

0.058

0.0

37

0.091

0.0

17

0.151

0.0

82

0.032

0.0

64

0.052

0.0

69

0.048

0.1

72

6 0.1

380

5 0.1

38

0.131

0.2

37

0.215

0.0

75

0.041

0.1

12

0.019

0.1

69

0.094

0.0

35

. .

0.077

0.0

64

0.075

0.0

53

0.196

8 0.1

640

5 0.1

64

0.157

0.2

37

0.215

0.0

60

0.041

0.0

96

0.019

0.1

69

0.094

0.0

35

. .

. 0.0

77

0.064

0.0

75

0.053

0.1

96

8 0.1

640

6 0.

164

0.15

7 0.

262

0.23

%

0.076

0.0

45

0.117

0.0

21

0.188

0.1

06

0.038

0.0

89

0.075

0.0

80

0.057

0.2

20

10

0.190

0 8

0.190

0.1

81

0.312

0.2

85

0.094

0.0

76

0.141

0.0

25

0.224

0.1

24

0.043

.

. 0.1

13

0.099

0.0

91

0.066

0.2

67

5 12

0.2

160

8 0.2

16

0.207

0.3

12

0.285

0.0

78

0.076

0.1

25

0.025

0.2

24

0.124

0.0

43

. .

0.113

0.0

99

0.091

0.0

66

0.267

12

0.216

0 10

0.2

16

0.207

0.3

62

0.333

0.1

11

0.060

0.1

66

0.029

0.2

60

0.148

0.0

48

. 0.1

37

0.122

0.1

02

0.075

0.3

13

'/4

0.250

0 10

0.2

50

0.240

0.3

62

0.333

0.0

91

0.060

0.1

46

0.029

0.2

60

0.148

0.0

48

. 0.1

37

0.122

0.1

02

0.075

0.3

13

'/‘,

0.250

0 12

0.2

50

0.240

0.4

12

0.380

0.1

24

0.068

0.1

87

0.033

0.2

97

0.172

0.0

54

0.162

0.1

45

0.113

0.0

84

0.362

5/e

0.312

5 12

0.3

12

0.302

0.4

12

0.380

0.0

87

0.068

0.1

50

0.033

0.2

97

0.172

0.0

54

. 0.1

62

0.145

0.1

13

0.084

0.3

62

%

0.312

5 &

0.312

0.3

02

0.477

0.4

42

0.130

0.0

79

0.202

0.0

38

0.344

0.1

95

0.061

0.1

93

0.176

0.1

29

0.095

0.4

24

"/B

0.375

0 5/1

6 0.3

75

0.364

0.5

97

0.556

0.7

73

0.099

0.2

65

0.048

0.4

32

0.252

0.0

74

0.251

0.2

32

0.155

0.1

17

0.539

GENE

RAL

NOTE

S:

(a)

For

addit

ional

requ

irem

ents

refer

to

pa

ra.

2.

(b)

For

refer

ence

, se

e Ta

ble

8C

Illustr

ation

on

pre

vious

pa

ge.

NOTE

S:

(1)

Shor

t sc

rews

inc

lude

nom

inal

length

s up

to

an

d inc

luding

l'/s

in.

fo

r siz

es

No.

5 an

d sm

aller

, an

d 2

in.

for

sizes

No

. 6

and

large

r. (2

) W

here

spec

ifying

no

mina

l siz

e in

decim

als,

zeros

pre

cedin

g de

cimal

and

in the

fou

rth

decim

al pla

ce

shall

be

om

itted.

(3

) Ta

bulat

ed

value

s de

term

ined

from

for

mula

fo

r m

axim

um

H in

Appe

ndix

A.

(4)

Tabu

lated

va

lues

deter

mine

d fro

m

form

ula

for

max

imum

CJ

in

Appe

ndix

A.

(5)

Point

sa

me

on

all

drive

rs.

(6)

No

tolera

nce

for

gagin

g dia

mete

r is

given

. If

the

gagin

g dia

mete

r of

the

ga

ge

used

dif

fers

from

tab

ulated

va

lue,

the

protru

sion

will

be

affec

ted

acco

rding

ly an

d the

pro

per

protru

sion

value

s m

ust

be

recalc

ulated

us

ing

the

form

ulas

show

n in

Appe

ndix

I.


STDOASME BLB-b.3-ENGL L998 m 0757b70 ObL4220 b78


J - l Irtl

TABLE 9A DIMENSIONS OF SLOTTED PAN HEAD MACHINE SCREWS

Nominal Size or Basic Screw

Diameter

Head Head Diameter Head Height Slot Width Slot Depth Radius

A H J T R. LNote (111 Max. Min. Max. Min. Max. Max. Min. Max. Min.

~ ~ ~~~

O000 0.02 1 o O00 0.0340 O0 0.0470

0.042 0.036 0.016 0.010 0.007 0.066 0.060 0.023 0.017 0.010 0.090 0.082 0.032 0.025 0.015

0.008 0.012 0.017

0.004 0.008 0.010

0.008 0.004 0.012 0.008 0.016 0.010

0.116 0.104 0.039 0.031 0.020 0.142 0.130 0.046 0.038 0.025 0.167 0.155 0.053 0.045 0.035 O. 193 0.180 0.060 0.051 0.037

0.023 0.026 0.031 0.035

0.016 0.019 0.023 0.027

0.022 0.014 0.027 0.018 0.031 0.022 0.036 0.026

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

0.2 19 0.205 0.068 0.058 0.042 0.245 0.231 0.075 0.065 0.044 0.270 0.256 0.082 0.072 0.046

0.039 0.043 0.048

0.031 0.035 0.039

0.040 0.030 0.045 0.034 0.050 0.037

8 0.1640 10 0.1900 12 0.2160

0.322 0.306 0.096 0.085 0.052 0.373 0.357 0.110 0.099 0.061 0.425 0.407 0.125 0.112 0.078

0.054 0.060 0.067

0.045 0.050 0.056

0.058 0.045 0.068 0.053 0.077 0.061

0.2500 5/16 0.3125

'Il6 0.4375

'/. 0.5000

'//B 0.6250 '/A 0.7500

'/B 0.3750

9/16 0.5625

0.492 0.473 0.144 0.130 0.087 0.615 0.594 0.178 0.162 0.099 0.740 0.716 0.2 12 0.195 0.143 0.863 0.837 0.247 0.228 O. 153

0.075 0.084 0.094 0.094

0.064 0.072 0.081 0.081

0.087 0.070 O. 106 0.085 O. 124 o. 1 O0 0.142 0.116

0.987 0.958 0.281 0.260 O. 175 1.041 1.000 0.315 0.293 O. 197 1.172 1.125 0.350 0.325 0.219 1.435 1.375 0.419 0.390 0.263

0.106 0.118 O. 133 0.149

0.091 0.102 0.116 0.131

0.161 0.131 0.179 0.146 O. 197 0.162 0.234 0.192

GENERAL NOTE: For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

48



This type of recess has a large I I

center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.

TABLE 9B DIMENSIONS OF TYPE I CROSS RECESSED PAN HEAD MACHINE SCREWS

Nominal Size Head Head Head Recess Recess Recess or Basic Screw Diameter

A Height Radius Diameter H M

Depth Width Penetration

Diameter R [Note (1)J Max. Min. Max. Min. Min. Max. Min. Max. Min. Min. Size Max. Min.

T N, Driver Gaging Depth

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

'/4 0.2500

'4 0.3750 0.4375

'/2 0.5000

7 8 0.6250

v76 0.3125

9/16 0.5625

0.116 0.104 0.044 0.036 0.005 0.067 0.054 0.039 0.021 0.142 0.130 0.053 0.044 0.005 0.074 0.061 0.045 0.025 0.167 0.155 0.062 0.053 0.010 0.104 0.091 0.059 0.041 0.193 0.180 0.071 0.062 0.010 0.112 0.099 0.068 0.050

0.219 0.205 0.080 0.070 0.010 0.122 0.109 0.078 0.060 0.245 0.231 0.089 0.079 0.015 0.158 0.145 0.083 0.057 0.270 0.256 0.097 0.087 0.015 0.166 0.153 0.091 0.066

0.322 0.306 0.115 0.105 0.015 0.182 0.169 0.108 0.082 0.373 0.357 0.133 0.122 0.020 0.199 0.186 0.124 0.100 0.425 0.407 0.151 0.139 0.025 0.259 0.246 0.141 0.115

0.492 0.473 0.175 0.162 0.035 0.281 0.268 0.161 0.135 0.615 0.594 0.218 0.203 0.040 0.350 0.337 0.193 0.169 0.740 0.716 0.261 0.244 0.040 0.389 0.376 0.233 0.210 0.863 0.837 0.305 0.284 0.050 0.413 0.400 0.259 0.234

0.987 0.958 0.348 0.325 0.055 0.435 0.422 0.280 0.255 1.041 1.000 0.391 0.366 0.065 0.470 0.447 0.312 0.288 1.172 1.125 0.434 0.406 0.075 0.587 0.564 0.343 0.314

0.013 0.014 0.017 0.019

0.019 0.028 0.028

0.030 0.031 0.034

0.036 0.059 0.065 0.068

0.071 0.076 0.081

O 0.032 0.014 O 0.040 0.022 1 0.052 0.034 1 0.061 0.043

1 0.071 0.053 2 0.072 0.046 2 0.080 0.055

2 0.097 0.071 2 0.113 0.089 3 0.124 0.098

3 0.144 0.118 4 0.173 0.149 4 0.213 0.190 4 0.239 0.214

4 0.260 0.235 4 0.292 0.268 5 0.310 0.281


49


STDOASME BLB-b.3-ENGL L998 m 0759670 ObLV222 460 m



TABLE 9C DIMENSIONS OF TYPE IA CROSS RECESSED PAN HEAD MACHINE SCREWS

Nominal Size or Basic Screw Diameter Diameter [Note

Head Head Head Recess Recess Depth Width

Recess Penetration Height Radius Diameter

R, H M T N, Driver Gaging Depth A

(111 Max. Min. Max. Min. Min. Max. Min. Max. Min. Min. Size Max. Min.

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

74 0.2500 5/16 0.3125 '/e 0.3750

'/le 0.4375

'/2 0.5000 916 0.5625 '/e 0.6250 '/4 0.7500

0.116 0.104 0.044 0.036 0.005 0.142 0.130 0.053 0.044 0.005 0.167 0.155 0.062 0.053 0.010 0.193 0.180 0.071 0.062 0.010

0.219 0.205 0.080 0.070 0.010 0.245 0.231 0.089 0.079 0.015 0.270 0.256 0.097 0.087 0.015

0.322 0.306 0.115 0.105 0.015 0.373 0.357 0.133 0.122 0.020 0.425 0.407 0.151 0.139 0.025

0.492 0.473 0.175 0.162 0.035 0.615 0.594 0.218 0.203 0.040 0.740 0.716 0.261 0.244 0.040 0.863 0.837 0.305 0.284 0.050

0.987 0.958 0.348 0.325 0.055 1.041 1.000 0.391 0.366 0.065 1.172 1.125 0.434 0.406 0.075 1.435 1.375 0.521 0.488 0.085

0.067 0.054 0.040 0.024 0.018 0.074 0.061 0.047 0.031 0.018 0.104 0.091 0.064 0.048 0.028 0.112 0.099 0.073 0.057 0.029

0.122 0.109 0.083 0.067 0.029 0.154 0.141 0.084 0.066 0.040 0.162 0.149 0.092 0.074 0.040

0.177 0.164 0.108 0.090 0.041 0.193 0.180 0.124 0.106 0.041 0.254 0.241 0.139 0.121 0.056

0.273 0.260 0.159 0.141 0.057 0.341 0.328 0.191 0.173 0.086 0.377 0.364 0.228 0.210 0.086 0.399 0.386 0.251 0.233 0.086

0.420 0.407 0.273 0.255 0.086 0.456 0.433 0.304 0.286 0.087 0.570 0.547 0.333 0.312 0.098 0.614 0.591 0.379 0.358 0.098

O O 1 1

1 2 2

2 2 3

3 4 4 4

4 4 5 5

0.033 0.017 0.040 0.024 0.053 0.037 0.062 0.046

0.072 0.056 0.068 0.050 0.076 0.058

0.092 0.074 0.108 0.090 0.117 0.099

0.137 0.119 0.164 0.146 0.201 0.183 0.224 0.206

0.246 0.228 0.277 0.259 0.295 0.274 0.341 0.320


50



This type of recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at bottom of recess.

TABLE 9D DIMENSIONS OF TYPE II CROSS RECESSED PAN HEAD MACHINE SCREWS

Nominal Size or Basic Screw Diameter [Note

(Il1

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

0.2500 5/16 0.3125 '/8 0.3750

'/16 0.4375

'/2 0.5000 0.5625

'/a 0.6250 0.7500

Head Diameter

A

Head Height H

Max. Min. Max. Min.

0.116 0.104 0.142 0.130 0.167 0.155 0.193 0.180

0.044 0.036 0.053 0.044 0.062 0.053 0.071 0.062

Head Radius

R. Min.

0.005 0.005 0.010 0.010

Recess Diameter

M

Recess Depth

T

Max. Min. Max. Min.

Recess Width Driver N. Size

Min. [Note (2)l

Recess Penetration

Gaging Depth

Max. Min.

0.076 0.066 0.089 0.079 0.109 0.097 0.125 0.113

0.038 0.026 0.046 0.034 0.059 0.046 0.069 0.056

0.022 . . . 0.024 . . . 0.027 . . . 0.029 . . .

Note (3) Note (3) Note (3) Note (3)

0.033 0.022 0.043 0.032

0.219 0.205 0.080 0.070 0.010 0.143 0.130 0.079 0.066 0.032 . . . 0.055 0.043 0.245 0.231 0.089 0.079 0.015 0.159 0.145 0.090 0.076 0.034 . . . 0.066 0.052 0.270 0.256 0.097 0.087 0.015 0.176 0.162 0.096 0.082 0.037 . . . 0.077 0.064

0.322 0.306 0.115 0.105 0.015 0.207 0.192 0.116 0.101 0.041 . . . 0.097 0.083 0.373 0.357 0.133 0.122 0.020 0.240 0.224 0.137 0.122 0.046 . . . 0.118 0.104 0.425 0.407 0.151 0.139 0.025 0.272 0.254 0.158 0.142 0.051 . . . 0.139 0.124

0.492 0.473 0.175 0.162 0.035 0.318 0.300 0.180 0.163 0.058 . . . 0.169 0.153 0.615 0.594 0.218 0.203 0.040 0.396 0.375 0.231 0.212 0.069 . . . 0.220 0.202 0.740 0.716 0.261 0.244 0.040 0.480 0.457 0.286 0.266 0.081 . . . 0.275 0.256 0.863 0.837 0.305 0.284 0.050 0.557 0.531 0.336 0.314 0.093 . . . 0.325 0.304

0.987 0.958 0.348 0.325 0.055 0.630 0.604 0.384 0.362 0.104 . . . 0.373 0.352 1.041 1.000 0.391 0.366 0.065 0.638 0.612 0.389 0.367 0.105 . . . 0.378 0.357 1.172 1.125 0.434 0.406 0.075 0.638 0.612 0.389 0.367 0.105 . . . 0.378 0.357 1.435 1.375 0.521 0.488 0.085 0.638 0.612 0.389 0.367 0.105 . . . 0.378 0.357

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Point same on all drivers. (3) Not practical to gage.

51



J 2 1 Tu Note (l)

TABLE 10A DIMENSIONS OF SLOlTED FILLISTER HEAD MACHINE SCREWS

Nominal Size or Basic Screw Diameter [Note

Head Head Side Total Head Slot Slot Diameter Height Height Width Depth

A H O J T

(211 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.

O000 0.02 1 o O00 0.0340 O0 0.0470

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

'/4 0.2500 0.3125

"/8 0.3750 0.4375

'/2 0.5000 '/le 0.5625

5/8 0.6250 3/, 0.7500

0.038 0.059 0.082

0.096 0.118 0.140 0.161

0.183 0.205 0.226

0.270 0.313 0.357

0.414 0.518 0.622 0.625

0.750 0.812 0.875 1 .O00

0.032 0.053 0.072

0.083 0.104 0.124 0.145

0.166 0.187 0.208

0.250 0.292 0.334

0.389 0.490 0.590 0.589

0.710 0.768 0.827 0.945

0.019 0.029 0.037

0.043 0.053 0.062 0.070

0.079 0.088 0.096

0.113 0.130 0.148

0.170 0.21 1 0.253 0.265

0.297 0.336 0.375 0.441

0.01 1 0.021 0.028

0.038 0.045 0.053 0.061

0.069 0.078 0.086

o. 1 o2 0.118 O. 134

O. 155 0.194 0.233 0.242

0.273 0.308 0.345 0.406

0.025 0.015 0.008 0.004 0.012 0.006 0.035 0.027 0.012 0.006 0.017 0.011 0.047 0.039 0.017 0.010 0.022 0.015

0.055 0.047 0.023 0.016 0.025 0.015 0.066 0.058 0.026 0.019 0.031 0.020 0.083 0.066 0.031 0.023 0.037 0.025 0.095 0.077 0.035 0.027 0.043 0.030

0.107 0.088 0.039 0.031 0.048 0.035 0.120 0.100 0.043 0.035 0.054 0.040 0.132 0.111 0.048 0.039 0.060 0.045

0.156 0.133 0.054 0.045 0.071 0.054 0.180 0.156 0.060 0.050 0.083 0.064 0.205 0.178 0.067 0.056 0.094 0.074

0.237 0.207 0.075 0.064 0.109 0.087 0.295 0.262 0.084 0.072 0.137 0.110 0.355 0.315 0.094 0.081 0.164 0.133 0.368 0.321 0.094 0.081 0.170 0.135

0.412 0.362 0.106 0.091 0.190 0.151 0.466 0.410 0.118 0.102 0.214 0.172 0.521 0.461 0.133 0.116 0.240 0.193 0.612 0.542 0.149 0.131 0.281 0.226

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is equal

(2) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. to no less than 90% of the specified minimum head diameter.

52


Thist

ype

of

rece

ss

has

a la

rge

z ce

nter

open

ing,ta

pere

d wi

ngs,

an

d bl

untb

otto

m,w

ith

all

s ed

ges

relie

ved

or

roun

ded.

z

TABL

E 10

B D

IMEN

SIO

NS

OF

TYPE

I

CR

OSS

R

ECES

SED

FI

LLIS

TER

H

EAD

M

ACH

INE

SCR

EWS

z G

Nom

inal

Size

or

Basic

Sc

rew

Diam

eter

[Not

e (2

11

Head

Di

amete

r

A

Max

. M

in.

Head

Sid

e To

tal

Head

Re

cess

Heigh

t He

ight

Diam

eter

H 0

M

Max

. M

in.

Max

. M

in.

Max

. M

in.

Rece

ss

Depth

T

Max

. M

in.

Rece

ss

Widt

h N,

Min.

Drive

r

Size

Rece

ss

d

Pene

tratio

n E

Gagin

g De

pth

;;1

Max

. M

in.

0 0.

0600

0.0

96

0.08

3 0.

043

0.03

8 0.

055

0.04

7 0.

067

0.05

4 0.0

39

0.02

1 0.

013

1 0.

0730

0.

118

0.10

4 0.

053

0.04

5 0.

066

0.05

8 0.

074

0.06

1 0.

045

0.02

5 0.

014

2 2

0.08

60

0.14

0 0.

124

0.06

2 0.

053

0.08

3 0.

066

0.10

4 0.

091

0.05

9 0.

041

0.01

7 3

0.09

90

0.16

1 0.

145

0.07

0 0.

061

0.09

5 0.

077

0.11

2 0.

099

0.06

8 0.

050

0.01

9

0.03

2 0.

014

0.04

0 0.

022

0.05

2 0.

034

0.06

1 0.

043

4 0.

1120

0.

183

0.16

6 0.

079

0.06

9 0.

107

0.08

8 0.

122

0.10

9 0.

078

0.06

0 0.

019

1 0.

071

0.05

3 5

0.12

50

0.20

5 0.

187

0.08

8 0.

078

0.12

0 0.

100

0.14

3 0.

130

0.06

7 0.

042

0.02

7 2

0.05

6 0.

031

6 0.

1380

0.

226

0.20

8 0.

096

0.08

6 0.

132

0.11

1 0.

166

0.15

3 0.

091

0.06

6 0.

028

2 0.

080

0.05

5

8 0.

1640

0.

270

0.25

0 0.

113

0.10

2 0.

156

0.13

3 0.

182

0.16

9 0.

108

0.08

2 0.

030

2 0.0

97

0.07

1 10

0.

1900

0.

313

0.29

2 0.

130

0.11

8 0.

180

0.15

6 0.

199

0.18

6 0.

124

0.10

0 0.

031

2 0.

113

0.08

9 12

0.

2160

0.

357

0.33

4 0.

148

0.13

4 0.

205

0.17

8 0.

259

0.24

6 0.

141

0.11

5 0.

034

3 0.

124

0.09

8

'L,

0.25

00

0.41

4 0.

389

0.17

0 0.

155

0.23

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207

0.28

1 0.

268

0.16

1 0.

135

0.03

6 5/

6 0.

3125

0.

518

0.49

0 0.

211

0.19

4 0.

295

0.26

2 0.

322

0.30

9 0.

203

0.17

7 0.

042

3/,

0.37

50

0.62

2 0.

590

0.25

3 0.

233

0.35

5 0.

315

0.38

9 0.

376

0.23

3 0.

210

0.06

5 7/

s 0.

4375

0.

625

0.58

9 0.

265

0.24

2 0.

368

0.32

1 0.

413

0.40

0 0.

259

0.23

4 0.

068

0.144

0.

118

0.18

6 0.

160

0.21

3 0.

190

0.23

9 0.

214

Y*

0.50

00

9/6

0.56

25

"/8

0.62

50

0.75

0 0.

812

0.87

5

0.71

0 0.

768

0.82

7

0.29

7 0.

336

0.37

5 0.

441

0.27

3 0.

308

0.34

5

0.41

2 0.

466

0.52

1 0.

612

0.36

2 0.

410

0.46

1 0.

542

0.43

5 0.

470

0.58

7 0.

633

0.42

2 0.

442

0.56

4 0.

610

0.28

0 0.

312

0.34

3 0.

382

0.25

5 0.

071

4 0.

260

0.23

5 0.

288

0.07

6 4

0.29

2 0.

268

0.31

4 0.

081

5 0.

310

0.28

1 g

"/4

0.75

00

1 .oo

o 0.

945

0.40

6 0.

355

0.08

6 5

0.34

9 0.

322

2 m

GEN

ERAL

NO

TE:

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

L%

NO

TES:

b,

(1)

A sl

ight

ro

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g of

th

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ges

at

perip

hery

of

he

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shal

l be

pe

rmiss

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pr

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d th

e dia

met

er

of

the

bear

ing

circ

le

is

equa

l to

no

le

ss

than

90

%

of

the

spec

ified

2 m

inim

um

head

dia

met

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(2)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

zero

s pr

eced

ing

decim

al

and

in

the

four

th

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al

plac

e sh

all

be

omitt

ed.

Ei


This

typ

e of

re

cess

ha

s a

larg

e ce

nter

op

enin

g,

wide

st

raig

ht

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s,

and

blun

t bo

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, wi

th

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edge

s re

lieve

d or

ro

unde

d.

TABL

E 1 O

C IL

LUST

RAT

ION


Fi

TABL

E IO

C

DIM

ENSI

ON

S O

F TY

PE

IA C

RO

SS

REC

ESSE

D

FILL

ISTE

R

HEA

D

MAC

HIN

E SC

REW

S %

z Ifi

No

mina

l Siz

e

or

Basic

Sc

rew

Diam

eter

[Not

e (2

11

-

Head

Di

amete

r

A

Max

. M

in.

Head

Sid

e To

tal

Head

Re

cess

Heigh

t He

ight

Diam

eter

H 0

M

Max

. M

in.

Max

. M

in.

Max

. M

in.

Rece

ss

Depth

T

Max

. M

in.

Rece

ss

Rece

ss

g

Widt

h Pe

netra

tion

Gagin

g De

pth

$ N.

Dr

iver

Min.

Siz

e M

ax.

Min.

5 2

0 0.

0600

0.0

96

0.08

3 0.

043

0.03

8 0.

055

0.04

7 0.

067

0.05

4 0.

040

0.02

4 0.

018

1 0.

0730

0.

118

0.10

4 0.

053

0.04

5 0.

066

0.05

8 0.

074

0.06

1 0.

047

0.03

1 0.

018

2 0.

0860

0.

140

0.12

4 0.

062

0.05

3 0.

083

0.06

6 0.

104

0.09

1 0.

064

0.04

8 0.

028

3 0.

0990

0.

161

0.14

5 0.

070

0.06

1 0.

095

0.07

7 0.

112

0.09

9 0.

073

0.05

7 0.

029

4 0.

1120

5

0.12

50

6 0.

1380

8 0.

1640

10

0.

1900

2

12

0.21

60

'/4

0.25

00

hi

0.31

25

"/8

0.37

50

%6

0.43

75

5;

0.50

00

g/,6

0.

5625

?'8

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50

"/4

0.75

00

0.18

3 0.

166

0.07

9 0.

069

0.10

7 0.

088

0.12

2 0.

109

0.08

3 0.

067

0.02

9 1

0.07

2 0.

056

E 0.

205

0.18

7 0.

088

0.07

8 0.

120

0.10

0 0.

140

0.12

7 0.

070

0.05

2 0.

040

2 0.

054

0.03

6 2

0.22

6 0.

208

0.09

6 0.

086

0.13

2 0.

111

0.16

2 0.

149

0.09

2 0.

074

0.04

0 2

0.07

6 0.

058

0.27

0 0.

250

0.11

3 0.

102

0.15

6 0.

133

0.17

7 0.

164

0.10

8 0.

090

0.04

1 2

0.092

0.

074

0.31

3 0.

292

0.13

0 0.

118

0.18

0 0.

156

0.19

3 0.

180

0.12

4 0.

106

0.04

1 2

0.10

8 0.

090

0.35

7 0.

334

0.14

8 0.

134

0.20

5 0.

178

0.25

4 0.

241

0.13

9 0.

121

0.05

6 3

0.11

7 0.

099

0.41

4 0.3

89

0.17

0 0.

155

0.23

7 0.

207

0.27

3 0.

260

0.15

9 0.

141

0.05

7

0.51

8 0.

490

0.21

1 0.

194

0.29

5 0.

262

0.31

5 0.

302

0.20

2 0.

184

0.05

7 0.

622

0.59

0 0.

253

0.23

3 0.

355

0.31

5 0.

377

0.36

4 0.

228

0.21

0 0.

086

0.62

5 0.

589

0.26

5 0.

242

0.36

8 0.

321

0.39

9 0.

386

0.25

1 0.

233

0.08

6

0.75

0 0.

710

0.29

7 0.

273

0.41

2 0.

362

0.42

0 0.

407

0.27

3 0.

255

0.08

6 0.

812

0.76

8 0.

336

0.30

8 0.

466

0.41

0 0.

456

0.43

3 0.

304

0.28

6 0.

087

0.87

5 0.

827

0.37

5 0.

345

0.52

1 0.

461

0.57

0 0.

547

0.33

3 0.

312

0.09

8 1.

000

0.94

5 0.

441

0.40

6 0.

612

0.54

2 0.

614

0.59

1 0.

379

0.35

8 0.

098

0.03

3 0.

040

0.05

3 0.

062

0.13

7 0.1

19

0.18

1 0.

163

0.20

1 0.

183

0.22

4 0.

206

0.24

6 0.

228

0.27

7 0.

259

0.29

5 0.

274

0.34

1 0.

320

0.01

7 g

0.02

4 0.

037

i?

0.04

6 2 z

GEN

ERAL

NOTE

S:

(a)

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

(b

) Fo

r re

fere

nce,

se

e Ta

ble

1OC

illust

ratio

n on

pr

eviou

s pa

ge.

NOTE

S:

(I)

A sl

ight

ro

undin

g of

th

e ed

ges

at

perip

hery

of

he

ad

shal

l be

pe

rmiss

ible

pr

ovide

d th

e dia

met

er

of

the

bear

ing

circ

le

is

equa

l to

no

le

ss

than

90

%

of

the

spec

ified

min

imum

he

ad

diam

eter

. (2

) W

here

sp

ecify

ing

nom

inal

siz

e in

de

cimal

s,

zero

s pr

eced

ing

decim

al

and

in

the

four

th

decim

al

plac

e sh

all

be

omitt

ed.


This

typ

e of

re

cess

co

nsis

ts

of

two

inte

rsec

ting

slot

s wi

th

para

llel

side

s co

nver

ging

to

a sli

ghtly

tru

ncat

ed

apex

at

bo

ttom

of

re

cess

.

TABL

E 10

D

DIM

ENSI

ON

S O

F TY

PE

II C

RO

SS

REC

ESSE

D

FILL

ISTE

R

HEA

D

MAC

HIN

E SC

REW

S

Nom

inal

Size

Head

He

ad

Side

Tota

l He

ad

Rece

ss

or

Basic

Sc

rew

Diam

eter

Heigh

t He

ight

Diam

eter

Rece

ss

Depth

Re

cess

Pe

netra

tion

Diam

eter

A H

0 M

T Re

cess

W

idth

Dr

iver

N Si

ze

Gagin

g De

pth

[Not

e HI

M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

M

in.

[Not

e (31

1 M

ax.

Min.

0 0.

0600

0.0

96

0.08

3 0.

043

0.03

8 0.

055

0.04

7 0.

072

0.06

2 0.

035

0.02

3 0.

020

Note

(4

) No

te

(4)

1 0.

0730

0.

118

0.10

4 0.

053

0.04

5 0.

066

0.05

8 0.

088

0.07

8 0.

045

0.03

4 0.

022

Note

(4

) No

te

(4)

2 0.

0860

0.

140

0.12

4 0.

062

0.05

3 0.

083

0.06

6 0.

105

0.09

3 0.

056

0.04

4 0.

024

0.03

0 0.

019

3 0.

0990

0.

161

0.14

5 0.

070

0.06

1 0.

095

0.07

7 0.

121

0.10

9 0.

067

0.05

4 0.

027

0.04

1 0.

029

4 0.

1120

0.

183

5 0.

1250

0.

205

6 0.

1380

0.

226

0.07

9

0.08

8 0.

096

0.06

9

0.07

8 0.

086

0.10

7

0.12

0 0.

132

0.08

8

0.10

0 0.

111

0.13

7

0.15

4 0.

170

0.12

4

0.14

0 0.

156

0.07

7

0.08

6 0.

097

0.06

4

0.07

2 0.

083

0.02

9

0.03

1 0.

034

8 0.

1640

10

0.

1900

12

0.

2160

'/4

0.25

00

%I3

0.

3125

"/8

0.

3750

7/

pj

0.43

75

'/*

0.50

00

g/,6

0.

5625

5/

8 0.

6250

"/4

0.

7500

0.27

0 0.

313

0.35

7

0.16

6 0.

051

0.03

9

0.18

7 0.

062

0.04

9 0.

208

0.07

3 0.

060

0.25

0 0.

094

0.08

0 0.

292

0.11

5 0.

101

z 0.

334

0.13

7 0.

121

5

0.38

9

0.49

0 0.

590

0.58

9

0.11

3 0.

130

0.14

8

0.10

2 0.

118

0.13

4

0.15

6 0.

180

0.20

5

0.13

3 0.

156

0.17

8

0.20

2 0.

235

0.26

8

0.18

7 0.

219

0.25

0

0.11

8 0.

134

0.15

6

0.10

3 0.

119

0.13

9

0.03

9 0.

043

0.04

8

0.41

4

0.51

8 0.

622

0.62

5

0.17

0 0.

211

0.25

3

0.26

5

0.15

5 0.

194

0.23

3 0.

242

0.23

7

0.29

5 0.

355

0.36

8

0.20

7 0.

262

0.31

5

0.32

1

0.30

8

0.38

8 0.

466

0.46

6

0.29

0

0.36

7 0.

442

0.44

2

0.18

2

0.22

6 0.

277

0.27

7

0.16

5

0.20

7 0.

256

0.25

6

0.05

4

0.06

6 0.

077

0.07

7

0.09

1 0.

097

0.09

7 0.

097

0.16

3 0.

163

0.14

7 0.

147

K K

0.21

5 0.

215

0.19

7 0.

197

: : 0.

266

0.26

6 0.

246

0.24

6 2 2

0.26

6 0.

266

0.24

6 0.

246

D D - -

0.75

0 0.

812

0.87

5 1.

000

0.71

0 0.

768

0.82

7 0.

945

m

0.29

7 0.

336

0.37

5 0.

441

0.27

3 0.

308

0.34

5 0.

406

0.41

2 0.

466

0.52

1 0.

612

0.36

2 0.

410

0.46

1 0.

542

0.56

2 0.

609

0.60

9 0.

609

0.53

2 0.

576

0.57

6 0.

576

0.33

9 0.

370

0.37

0 0.

370

0.31

5 0.

343

0.34

3 0.

343

0.32

8 0.

305

6

0.35

9 0.

333

$ 0.

359

0.33

3 2

0.35

9 0.

333

2

GEN

ERAL

NO

TE:

For

addi

tiona

l re

quire

men

ts re

fer

to

para

. 2.

E

NOTE

S:

z (I)

A

slig

ht

roun

ding

of

the

edge

s at

pe

riphe

ry

of

head

sh

all

be

perm

issib

le

prov

ided

the

diam

eter

of

th

e be

aring

ci

rcle

is

eq

ual

to

no

less

th

an

90%

of

th

e sp

ecifie

d z

min

imum

he

ad

diam

eter

. (2

) W

here

sp

ecify

ing

nom

inal

siz

e in

de

cimal

s,

zero

s pr

eced

ing

decim

al

and

in

the

four

th

decim

al

plac

e sh

all

be

omitt

ed.

(3)

Poin

t sa

me

on

all

drive

rs.

(4)

Not

prac

tical

to

ga

ge.



Note (1)

TABLE 11 DIMENSIONS OF SLOTTED DRILLED FILLISTER HEAD MACHINE SCREWS

Nominal Size Drilled Hole Drilled Hole Location Diameter

Diameter E, Basic F, Basic [Note [3)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. [Note 1111 [Note (111

2 0.0860 0.140 0.124 0.062 0.055 0.083 0.070 0.031 0.023 0.030 0.022 0.026 0.031 3 0.0990 0.161 0.145 0.070 0.064 0.095 0.082 0.035 0.027 0.034 0.026 0.030 0.037

Head Head Side Total Head Slot

A H O J T Height Height Slot Width Depth or Basic Screw IIiameter

4 0.1120 0.183 0.166 0.079 0.072 0.107 0.094 0.039 0.031 0.038 0.030 0.035 0.037 5 0.1250 0.205 0.187 0.088 0.081 0.120 0.106 0.043 0.035 0.042 0.033 0.038 0.046 6 0.1380 0.226 0.208 0.096 0.089 0.132 0.118 0.048 0.039 0.045 0.035 0.043 0.046

8 0.1640 0.270 0.250 0.113 0.106 0.156 0.141 0.054 0.045 0.065 0.054 0.043 0.046 10 0.1900 0.313 0.292 0.130 0.123 0.180 0.165 0.060 0.050 0.075 0.064 0.043 0.046 12 0.2160 0.357 0.334 0.148 0.139 0.205 0,188 0.067 0.056 0.087 0.074 0.053 0.046

'/4 0.2500 0.414 0.389 0.170 0.161 0.237 0.219 0.075 0.064 0.102 0.087 0.062 0.062 5/16 0.3125 0.518 0.490 0.211 0.201 0.295 0.276 0.084 0.072 0.130 0.110 0.078 0.070 3/s 0.3750 0.622 0.590 0.253 0.242 0.355 0.333 0.094 0.081 0.154 0.134 0.094 0.070

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Drilled hole shall be approximately perpendicular to the axis of slot and may be permitted to break through bottom of the

(2) A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is equal

(3) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

slot. Edges of the hole shall be free from burrs.

to no less than 90% of the specified minimum head diameter.

57


STD-ASME BLB.b.3-ENGL L998 0759670 Ob34230 537 H


TABLE IZA DIMENSIONS OF SLOTTED TRUSS HEAD MACHINE SCREWS


Diameter

Head Head Slot Slot Head Diameter Height Radius Width Depth

A H J T R, [Note (111 Max. Min. Max. Min. Max. Max. Min. Max. Min.

O000 0.0210 0.049 0.043 0.014 0.010 0.032 0.009 0.005 0.009 0.005 O00 0.0340 0.077 0.071 0.022 0.018 0.051 0.013 0.009 0.013 0.009 O0 0.0470 0.106 0.098 0.030 0.024 0.070 0.017 0.010 0.018 0.012

O 0.0600 0.131 0.119 0.037 0.029 0.087 0.023 0.016 0.022 0.014 1 0.0730 O. 164 0.149 0.045 0.037 0.107 0.026 0.019 0.027 0.018 2 0.0860 0.194 O. 180 0.053 0.044 o. 129 0.031 0.023 0.031 0.022 3 0.0990 0.226 0.21 1 0.061 0.051 0.151 0.035 0.027 0.036 0.026

4 0.1120 0.257 0.241 0.069 0.059 0.169 0.039 0.031 0.040 0.030 5 0.1250 0.289 0.272 0.078 0.066 0.191 0.043 0.035 0.045 0.034 6 0.1380 0.321 0.303 0.086 0.074 0.21 1 0.048 0.039 0.050 0.037

8 0.1640 0.384 0.364 0.102 0.088 0.254 0.054 0.045 0.058 0.045

12 0.2160 0.51 1 O. 487 O. 134 0.1 18 0.336 0.067 0.056 0.077 0.061 10 0.1900 0.448 0.425 0.118 O. 103 0.283 0.060 0.050 0.068 0.053

0.2500 0.573 0.546 0.150 0.133 0.375 0.075 0.064 0.087 0.070 '/,e 0.3125 0.698 0.666 0.183 0.162 0.457 0.084 0.072 O. 106 0.085 3/8 0.3750 0.823 0.787 0.215 0.191 0.538 0.094 0.081 O. 124 o. 1 O0

'/,G 0.4375 0.948 0.907 0.248 0.221 0.619 0.094 0.081 O. 142 0.116

0.5000 1 .O73 1 .O28 0.280 0.250 0.701 0.106 0.091 0.161 0.131 '416 0.5625 1.198 1.149 0.312 0.279 0.783 0.118 0.102 0.179 0.146

0.6250 1.323 1.269 0.345 0.309 0.863 0.133 0.116 0.196 O. 162 0.7500 1.573 1.51 1 0.410 0.368 1 .O24 0.149 0.131 0.234 0.182


58


STD.ASME B18-6-3-ENGL 1798 0757670 Ob14231 473 m



ASME 818.6.3-1998

Optional Shoulder for Long Screws With Reduced Body

TABLE 12B DIMENSIONS OF TYPE I CROSS RECESSED TRUSS HEAD MACHINE SCREWS

Nominal Size Head Head Recess Recess Height Diameter Depth

Recess Width

Recess Penetration or Basic Screw Oiameter

A H M J Diameter N. ~~i~~~ Gaging Depth [Note (111 Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

'/4 0.2500 0.3125

"/8 0.3750 '116 0.4375

'/z 0.5000 '115 0.5625 '18 0.6250 '14 0.7500

0.131 O. 164 O. 194 0.226

0.257 0.289 0.321

0.384 0.448 0.51 1

0.573 0.698 0.823 0.948

1 .O73 1.198 1.323 1.573

0.119 0.149 O. 180 0.21 1

0.241 0.272 0.303

0.364 0.425 0.487

0.546 0.666 0.787 0.907

1 .O28 1.149 1.269 1.511

0.037 0.045 0.053 0.061

0.069 0.078 0.086

o. 1 o2 0.1 18 O. 134

O. 150 0.183 0.215 0.248

0.280 0.312 0.345 0.410

0.029 0.037 0.044 0.051

0.059 0.066 0.074

0.088 0.103 0.118

0.133 0.162 0.191 0.221

0.250 0.279 0.309 0.368

0.063 0.071 0.104 0.110

0.112 0.128 O. 158

0.173 0.188 0.248

0.263 0.352 0.383 0.414

0.444 0.451 0.559 0.620

0.050 0.058 0.091 0.097

0.099 0.115 0.145

0.160 0.175 0.235

0.250 0.339 0.370 0.401

0.431 0.428 0.536 0.597

0.037 0.019 0.045 0.027 0.059 0.041 0.066 0.049

0.069 0.051 0.085 0.067 0.084 0.059

0.099 0.074 0.115 0.090 0.128 0.103

0.143 0.118 0.193 0.168 0.226 0.202 0.257 0.232

0.288 0.263 0.302 0.278 0.322 0.289 0.384 0.352

0.013 O 0.014 O 0.018 1 0.018 1

0.018 1 0.019 1 0.027 2

0.029 2 0.030 2 0.032 3

0.033 3 0.059 4 0.063 4 0.068 4

0.072 4 0.074 4 0.077 5 0.085 5

0.030 0.012 0.038 0.020 0.052 0.034 0.059 0.042

0.062 0.044 0.078 0.060 0.073 0.048

0.088 0.063 0.104 0.079 O. 11 1 0.086

0.126 0.101 0.173 0.148 0.206 0.182 0.237 0.212

0.268 0.243 0.282 0.258 0.289 0.256 0.351 0.319


59


STD-ASME B18.6-3-ENGL L998 W 0759670 Ob14232 30T W

ASME 818.6.3-1998





TABLE 12C DIMENSIONS OF TYPE IA CROSS RECESSED TRUSS HEAD MACHINE SCREWS

Nominal Size

Diameter

Head Head Recess Recess Height Diameter Depth

A H M T

Recess Width N.

Recess Penetration or Basic Screw Diameter

Driver Gaging Depth

[Note (111 Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

1/4 0.2500 Vl6 0.3125 "/8 0.3750 '/I6 0.4375

'/2 0.5000

'/a 0.6250 7 4 0.7500

9 / 1 6 0.5625

0.131 0.119 0.037 0.029 0.062 0.049 0.037 0.021 0.164 0.149 0.045 0.037 0.070 0.057 0.045 0.029 0.194 0.180 0.053 0.044 0.098 0.085 0.059 0.043 0.226 0.211 0.061 0.051 0.105 0.092 0.066 0.050

0.257 0.241 0.069 0.059 0.108 0.095 0.069 0.053 0.289 0.272 0.078 0.066 0.124 0.1 11 0.085 0.069 0.321 0.303 0.086 0.074 0.148 0.135 0.080 0.062

0.384 0.364 0.102 0.088 0.162 0.149 0.094 0.076 0.448 0.425 0.118 0.103 0.178 0.165 0,110 0.092 0.511 0.487 0.134 0.118 0.234 0.221 0.122 0.104

0.573 0.546 0.150 0.133 0.248 0.235 0.136 0.118 0.698 0.666 0.183 0.162 0.333 0.320 0.187 0.169 0.823 0.787 0.215 0.191 0.364 0.351 0.219 0.201 0.948 0.907 0.248 0.221 0.394 0.381 0.249 0.231

1.073 1.028 0.280 0.250 0.422 0.409 0.278 0.260 1.198 1.149 0.312 0.279 0.432 0.409 0.283 0.265 1.323 1.269 0.345 0.309 0.536 0.513 0.304 0.283 1.573 1.51 1 0.410 0.368 0.593 0.570 0.362 0.341

0.0 18 0.018 0.029 0.029

0.029 0.030 0.041

0.041 0.042 0.055

0.056 0.086 0.086 0.086

0.086 0.086 0.097 0.098

O 0.030 0.014 O 0.038 0.022 1 0.049 0.033 1 0.056 0.040

1 0.059 0.043 1 0.075 0.059 2 0.065 0.047

2 0.079 0.061 2 0.095 0.077 3 0.101 0.083

3 0.1 15 0.097 4 0.161 0.143 4 0.192 0.174 4 0.223 0.205

4 0.251 0.233 4 0.256 0.238 5 0.266 0.245 5 0.323 0.302


60


STD-ASIE B18-6.3-ENGL 177B W 0757670 Ob14233 24h m


1 k 0 . 0 6 2 min.


I

This t w e of recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at bottom of recess.


TABLE 12D DIMENSIONS OF TYPE II CROSS RECESSED TRUSS HEAD MACHINE SCREWS


Diameter [Note (1 ) l Max. Min. Max. Min. Min. Max. Min. Max. Min. Min. [Note (211 Max. Min.

Head Head Head Recess Recess Height Radius Diameter Depth Driver Recess Penetration

A H M T R. N. Size Gaging Depth

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

'14 0.2500 '/le 0.3125 "/8 0.3750

'116 0.4375

'12 0.5000 '116 0.5625 '18 0.6250 '14 0.7500

0.131 0.119 0.037 0.029 0.164 0.149 0.045 0.037 0.194 0.180 0.053 0.044 0.226 0.211 0.061 0.051

0.257 0.241 0.069 0.059 0.289 0.272 0.078 0.066 0.321 0.303 0.086 0.074

0.384 0.364 0.102 0.088 0.448 0.425 0.118 0.103 0.511 0.487 0.134 0.118

0.573 0.546 0.150 0.133 0.698 0.666 0.183 0.162 0.823 0.787 0.215 0.191 0.948 0.907 0.248 0.221

1.073 1.028 0.280 0.250 1.198 1.149 0.312 0.279 1.323 1.269 0.345 0.309 1.573 1.511 0.410 0.368

0.087 0.073 0.067 0.036 0.027 0.107 0.091 0.083 0.047 0.037 0.129 0.109 0.101 0.059 0.049 0.151 0.127 0.118 0.071 0.060

0.169 0.144 0.135 0.080 0.069 0.191 0.162 0.152 0.092 0.080 0.211 0.180 0.170 0.103 0.091

0.254 0.215 0.204 0.121 0.109 0.283 0.251 0.238 0.145 0.131 0.336 0.286 0.273 0.167 0.154

0.375 0.321 0.306 0.182 0.167 0.457 0.391 0.373 0.228 0.211 0.538 0.456 0.436 0.270 0.252 0.619 0.523 0.500 0.314 0.294

0.701 0.601 0.576 0.365 0.343 0.783 0.601 0.576 0.365 0.343 0.863 0.601 0.576 0.365 0.343 1.024 0.601 0.576 0.365 0.343

0.021 0.023 0.026 0.028

0.031 0.033 0.035

0.041 0.046 0.051

0.057 0.067 0.076 0.086

0.097 0.097 0.097 0.097

. . . Note (3)

. . . Note (3)

. . . 0.033

. . . 0.045

. . . 0.056

. . . 0.068

. . . 0.079

. . . 0.102

. . . O. 126

. . . O. 148

. . . 0.171

. . . 0.217

. . . 0.259

. . . 0.303

. . . 0.354

. . . 0.354

. . . 0.354

. . . 0.354

Note (3) Note (3)

0.024 0.035

0.046 0.057 0.068

0.091 0.113 O. 136

0.157 0.201 0.242 0.284

0.333 0.333 0.333 0.333

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Point same on all drivers. (3) Not practical to gage.

61


STDmASME BLB.b-3-ENGL 1978

ASME 818.6.3-1998

m 0759670 0'614234 L82 m


TABLE 13A DIMENSIONS OF SLOTTED BINDING HEAD MACHINE SCREWS

Undercut Undercut

Nominal Size

Diameter

Head Total Head Head Oval Diameter Depth

or Basic Screw Diameter Height Height Slot Width Slot Depth U X A O F J T [Note (211 [Note (211

[Note (311 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.

O000 0.02 1 o O00 0.0340 O0 0.0470

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

'/! 0.2500 5/16 0.3125 '/a 0.3750

0.046 0.040 0.014 0.009 0.006 0.003 0.008 0.004 0.009 0.005 . . . 0.073 0.067 0.021 0.015 0.008 0.005 0.012 0.006 0.013 0.009 . . . 0.098 0.090 0.028 0.023 0.011 0.007 0.017 0.010 0.018 0.012 . . .

. . . . . . . . .

. . . . . . . . .

. . . . . . . . .

0.126 0.119 0.032 0.026 0.012 0.008 0.023 0.016 0.018 0.009 0.098 0.086 0.007 0.002 0.153 0.145 0.041 0.035 0.015 0.011 0.026 0.019 0.024 0.014 0.120 0.105 0.008 0.003 0.181 0.171 0.050 0.043 0.018 0.013 0.031 0.023 0.030 0.020 0.141 0.124 0.010 0.005 0.208 0.197 0.059 0.052 0.022 0.016 0.035 0.027 0.036 0.025 0.162 0.143 0.011 0.006

0.235 0.223 0.068 0.061 0.025 0.018 0.039 0.031 0.042 0.030 0.184 0.161 0.012 0.007 0.263 0.249 0.078 0.069 0.029 0.021 0.043 0.035 0.048 0.035 0.205 0.180 0.014 0.009 0.290 0.275 0.087 0.078 0.032 0.024 0.048 0.039 0.053 0.040 0.226 0.199 0.015 0.010

0.344 0.326 0.105 0.095 0.039 0.029 0.054 0.045 0.065 0.050 0.269 0.236 0.017 0.012 0.399 0.378 0.123 0.112 0.045 0.034 0.060 0.050 0.077 0.060 0.312 0.274 0.020 0.015 0.454 0.430 0.141 0.130 0.052 0.039 0.067 0.056 0.089 0.070 0.354 0.311 0.023 0.018

0.525 0.498 0.165 0.152 0.061 0.046 0.075 0.064 0.105 0.084 0.410 0.360 0.026 0.021 0.656 0.622 0.209 0.194 0.077 0.059 0.084 0.072 0.134 0.108 0.513 0.450 0.032 0.027 0.788 0.746 0.253 0.235 0.094 0.071 0.094 0.081 0.163 0.132 0.615 0.540 O 039 0.034

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Break sharp edge on head where spherical and conical surfaces meet. (2) Unless otherwise specified by purchaser, slotted binding head machine screws shall not be undercut. (3) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

62




TABLE 13B DIMENSIONS OF TYPE I CROSS RECESSED BINDING HEAD MACHINE SCREWS

Recess


Diameter

Head Total Head Head Oval Recess Recess Depth Width

Penetration Gaging

N, Driver Depth

Height Height Diameter A O F M T

[Note (211 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

'/4 0.2500 '/,e 0.3125

3 / ~ 0.3750

0.126 0.119 0.153 0.145 0.181 0.171 0.208 0.197

0.235 0.223 0.263 0.249 0.290 0.275

0.344 0.326 0.399 0.378 0.454 0.430

0.525 0.498 0.656 0.622 0.788 0.746

0.032 0.041 0.050 0.059

0.068 0.078 0.087

0.105 O. 123 0.141

0.165 0.209 0.253

0.026 0.035 0.043 0.052

0.061 0.069 0.078

0.095 0.112 O. 130

0.152 0.194 0.235

0.012 0.015 0.018 0.022

0.025 0.029 0.032

0.039 0.045 0.052

0.061 0.077 0.094

0.008 0.01 1 0.01 3 0.016

0.018 0.021 0.024

0.029 0.034 0.039

0.046 0.059 0.071

0.067 0.074 0.100 0.110

0.118 0.148 0.160

0.186 0.205 0.267

0.281 0.350 0.400

0.054 0.061 0.087 0.097

0.105 0.135 0.147

0.173 0.192 0.254

0.268 0.337 0.387

0.040 0.047 0.058 0.068

0.077 0.075 0.088

0.114 0.134 0.151

0.164 0.195 0.247

0.023 0.030 0.041 0.051

0.059 0.051 0.064

0.090 0.109 0.126

0.140 0.172 0.223

0.013 0.014 0.017 0.017

0.017 0.025 0.026

0.028 0.029 0.032

0.046 0.068 0.076

O O 1 1

1 2 2

2 2 3

3 4 4

0.033 0.016 0.040 0.023 0.051 0.034 0.061 0.044

0.070 0.052 0.064 0.040 0.077 0.053

O. 103 0.079 0.123 0.098 0.134 0.109

0.147 0.123 0.175 0.152 0.227 0.203

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Break sharp edge on head where spherical and conical surfaces meet. (2) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted

63


STDmASME BZ8*6=3-ENGL 1998 m 0759670 ObL423b T55


5" c 3" A" Note (l'


TABLE 13C DIMENSIONS OF TYPE IA CROSS RECESSED BINDING HEAD MACHINE SCREWS

Recess Penetration

Gaging Depth

Nominal Size

Diameter [Note (211 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.

Head Total Head Head Oval Recess Recess Depth Width or Basic Screw Diameter Height Height Diameter

A O F M T N, Driver

O 0.0600 1 0.0730 2 0.0860 3 0.0990

4 0.1120 5 0.1250 6 0.1380

8 0.1640 10 0.1900 12 0.2160

'/d 0.2500 0.3125

'//B 0.3750

0.126 0.119 0.032 0.026 0.012 0.008 0.067 0.054 0.042 0.026 0.018 O 0.034 0.018 0.153 0.145 0.041 0.035 0.015 0.011 0.074 0.061 0.049 0.033 0.018 O 0.043 0.027 0.181 0.171 0.050 0.043 0.018 0.013 0.104 0.091 0.065 0.049 0.029 1 0.054 0.038 0.208 0.197 0.059 0.052 0.022 0.016 0.109 0.096 0.070 0.054 0.029 1 0.059 0.043

0.235 0.223 0.068 0.061 0.025 0.018 0.117 0.104 0.078 0.062 0.029 1 0.068 0.052 0.263 0.249 0.078 0.069 0.029 0.021 0.144 0.131 0.075 0.057 0.040 2 0.059 0.041 0.290 0.275 0.087 0.078 0.032 0.024 0.156 0.143 0.087 0.069 0.040 2 0.072 0.054

0.344 0.326 0.105 0.095 0.039 0.029 0.181 0.168 0.113 0.095 0.041 2 0.097 0.079 0.399 0.378 0.123 0.112 0.045 0.034 0.199 0.186 0.131 0.113 0.041 2 0.115 0.097 0.454 0.430 0.141 0.130 0.052 0.039 0.260 0.247 0.147 0.129 0.056 3 0.125 0.107

0.525 0.498 0.165 0.152 0.061 0.046 0.274 0.261 0.161 0.143 0.057 3 0.139 0.121 0.656 0.622 0.209 0.194 0.077 0.059 0.339 0.326 0.190 0.172 0.086 4 0.163 0.145 0.788 0.746 0.253 0.235 0.094 0.071 0.387 0.374 0.240 0.222 0.086 4 0.213 0.195

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Break sharp edge on head where spherical and conical surfaces meet. (2) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

64


STD-ASME B L B - b - 3 - E N G L L778 m 0759b70 Ob14237 771 m


Note (1) 5" f 3" ~


ASME 818.6.3-1998

'J O

TABLE 130 DIMENSIONS OF TYPE II CROSS RECESSED BINDING HEAD MACHINE SCREWS

Nominal Size Head Total Head Head Oval Recess or Basic Screw Diameter Height Height Diameter Depth Width Driver Recess Penetration

Diameter Gaging Depth

[Note (211 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. [Note (311 Max. Min.

Recess

A O F M T N. Size

O 0.0600 0.126 0.119 0.032 0.026 0.012 0.008 0.083 0.073 0.042 0.031 0.023 . . . Note (4) Note (4) 1 0.0730 0.153 0.145 0.041 0.035 0.015 0.011 0.097 0.087 0.051 0.040 0.025 . . . Note (4) Note (4) 2 0.0860 0.181 0.171 0.050 0.043 0.018 0.013 0.118 0.106 0.065 0.052 0.028 . . . 0.039 0.027 3 0.0990 0.208 0.197 0.059 0.052 0.022 0.016 0.136 0.124 0.077 0.064 0.031 . . . 0.051 0.039

4 0.1120 0.235 0.223 0.068 0.061 0.025 0.018 0.154 0.141 0.086 0.073 0.034 . , . 0.062 0.050 5 0.1250 0.263 0.249 0.078 0.069 0.029 0.021 0.172 0.158 0.098 0.084 0.036 . . . 0.074 0.061 6 0.1380 0.290 0.275 0.087 0.078 0.032 0.024 0.190 0.176 0.110 0.096 0.039 . . . 0.086 0.073

8 0.1640 0.344 0.326 0.105 0.095 0.039 0.029 0.224 0.209 0.126 0.112 0.044 . . . O. 108 0.094 10 0.1900 0.399 0.378 0.123 0.112 0.045 0.034 0.247 0.231 0.141 0.127 0.047 . . . 0.123 0.109 12 0.2160 0.454 0.430 0.141 0.130 0.052 0.039 0.293 0.275 0.171 0.155 0.054 . . , 0.153 0.137

'14 0.2500 0.525 0.498 0.165 0.152 0.061 0.046 0.329 0.311 0.187 0.171 0.059 . , . 0.176 0.160 5/16 0.3125 0.656 0.622 0.209 0.194 0.077 0.059 0.414 0.393 0.243 0.224 0.072 . . . 0.232 0.214

0.3750 0.788 0.746 0.253 0.235 0.094 0.071 0.480 0.456 0.286 0.265 0.081 , . . 0.275 0.255

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (I) Break sharp edge on head where spherical and conical surfaces meet. (2) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (3) Point same on all drivers. (4) Not practical to gage.

65


Shap

e of

in

dent

atio

n oo

tiona

l -

Slot

s m

ay

be

at

rand

om

to

hex

flats

[s

ee

Note

(1

11

Inde

nted

He

ad

Gag

ing

ring

7 t--

--W

I

Trim

med

He

ad

or

Fully

Up

set

Head

TABL

E 14

IL

LUST

RAT

ION


TABL

E 14

D

IMEN

SIO

NS

OF

PLAI

N

AND

SLO

TTED

R

EGU

LAR

AN

D LA

RG

E H

EX

HEA

D

MAC

HIN

E SC

REW

S

Larg

e He

ad

[Not

es

(4).

1711

No

min

al

Size

or

Basic

Scre

w Di

amete

r

[Note

(31

1

Regu

lar

Head

[Not

e (4

)l

Widt

h Ac

ross

Ac

ross

Fla

ts A

[Note

(51

1 Co

rners

W,

Min.

Max

. M

in.

[Note

s (5

). (61

1

Slot

Widt

h

[Not

: (I)

]

Slot

Depth

INote

skL

(811

Protr

usion

Beyo

nd

Gagin

g Ri

ng

F,

Min.

Head

Heigh

t H

Widt

h Ac

ross

Fla

ts A

Note

(511

Acro

ss

Corne

rs W

, M

in.

Max

. M

in.

(Not

es

(5J,

(6

11

Max

. M

in.

0.04

4 0.

036

0.05

0 0.

040

0.05

5 0.

044

Max

. M

in.

Max

. M

in.

[Note

(6

11

. .

0.02

2 .

. .

0.02

4 .

. .

. 0.

026

1 0.

0730

0.

125

0.12

0 0.

134

2 0.

0860

0.

125

0.12

0 0.

134

3 0.

0990

0.

188

0.18

1 0.

202

4 0.

1120

0.

188

0.18

1 0.

202

5 0.

1250

0.

188

0.18

1 0.

202

6 0.

1380

0.

250

0.24

4 0.

272

0.219

0.

213

0.23

8 0.

250

0.24

4 0.

272

. .

0.06

0 0.

049

0.039

0.

031

0.03

6 0.

025

0.02

9 0.

070

0.05

8 0.

043

0.03

5 0.

042

0.03

0 0.

035

0.09

3 0.

080

0.04

8 0.

039

0.04

6 0.

033

0.04

8

8 0.

1640

0.

250

0.24

4 0.

272

10

0.19

00

0.31

2 0.

305

0.34

0 12

0.

2160

0.

312

0.30

5 0.

340

0.31

2 0.

305

0.34

0 .

. .

0.37

5 0.

367

0.40

9

0.110

0.0

96

0.05

4 0.

045

0.06

6 0.

052

0.05

8 0.

120

0.10

5 0.

060

0.05

0 0.

072

0.05

7 0.

063

0.15

5 0.

139

0.06

7 0.

056

0.09

3 0.

077

0.08

3

‘/4

0.25

00

0.37

5 0.

367

0.409

?&

0.31

25

0.50

0 0.

489

0.54

5 %

0.

3750

0.

562

0.55

1 0.

614

0.43

8 0.

428

0.47

7 0.1

90

0.17

2 0.

075

0.06

4 0.

101

0.08

3 0.

103

0.23

0 0.

208

0.08

4 0.

072

0.12

2 0.

100

0.12

5 0.

295

0.27

0 0.

094

0.08

1 0.

156

0.13

1 0.

162

GEN

ERAL

NO

TES:

(a

) Fo

r ad

ditio

nal

requ

irem

ents

refe

r to

pa

ra.

2.

(b)

For

refe

renc

e,

see

Tabl

e 14

Illu

stra

tion

on

prev

ious

page

.

NOTE

S:

(1)

Unle

ss

othe

rwise

sp

ecifie

d by

pu

rcha

ser,

hex

head

m

achi

ne

scre

ws

are

not

slotte

d.

(2)

A sl

ight

ro

undin

g of

al

l ed

ges

and

corn

ers

of

the

hex

surfa

ces

of

inde

nted

he

x he

ads

shal

l be

pe

rmiss

ible

pr

ovide

d th

e dia

met

er

of

the

bear

ing

circ

le

is e

qual

to

no

le

ss

than

90

%

of

the

spec

ified

min

imum

wi

dth

acro

ss

flats

di

men

sion.

(3

) W

here

sp

ecify

ing

nom

inal

siz

e in

de

cimal

s,

zero

s pr

eced

ing

decim

al

and

in

the

four

th

decim

al

plac

e sh

all

be

omitt

ed.

(4)

Unle

ss

othe

rwise

sp

ecifie

d by

pu

rcha

ser,

regu

lar

hex

head

s sh

all

be

furn

ished

, an

d bo

th

regu

lar

and

larg

e he

ad

style

s m

ay

be

of

inde

nted

he

ad,

trim

med

he

ad,

or

fully

up

set

head

co

nstru

ctio

n,

at

the

optio

n of

m

anuf

actu

rer.

(5)

Dim

ensio

ns

acro

ss

flats

an

d ac

ross

co

rner

s of

th

e he

ad

shal

l be

m

easu

red

at

the

poin

t of

m

axim

um

met

al.

Tape

r of

si

des

of

hex

(ang

le be

twee

n on

e sid

e an

d th

e ax

is)

shal

l no

t ex

ceed

2”

or

0.

004

in.,

which

ever

is

gr

eate

r, th

e sp

ecifie

d wi

dth

acro

ss

flats

be

ing

the

larg

e di

men

sion.

(6

) Th

e ro

undin

g du

e to

la

ck

of

fill

on

all

six

corn

ers

of

the

head

sh

all

be

reas

onab

ly un

iform

an

d th

e wi

dth

acro

ss

corn

ers

of

the

head

sh

all

be

such

th

at

when

a

shar

p rin

g ha

ving

an

insid

e dia

met

er

equa

l to

th

e sp

ecifie

d m

inim

um

widt

h ac

ross

co

rner

s is

pl

aced

on

th

e to

p an

d bo

ttom

of

th

e he

ad,

the

head

sh

all

prot

rude

by

an

am

ount

eq

ual

to,

or

grea

ter

than

, th

e F

value

ta

bula

ted.

Se

e Ap

pend

ix II

for

acro

ss

corn

ers

gagi

ng

of

hex

head

s.

(7)

Larg

e he

x he

ad

is i

nten

ded

for

scre

w an

d wa

sher

as

sem

blie

s (s

ems)

as

sp

ecifie

d in

AS

ME

818.

13,

and

othe

r ap

plica

tions

re

quirin

g la

rge

bear

ing.

(8

) Sl

ot

dept

h be

yond

bo

ttom

of

in

dent

atio

n on

in

dent

ed

head

s sh

all

not

be

less

th

an

one-

third

of

th

e m

inim

um

slot

de

pth

spec

ified.


Gag

ing

ring

7 P-

WI

Slot

s m

ay

be

at

rand

om

to

hex

flats

[N

ote

(I)]

7 Sh

ape

of

inde

ntat

ion

optio

nal

[Not

e (2

)1-/

TABL

E 15

IL

LUST

RAT

ION

6 2 f m


2 2 m

:: it

TABL

E 15

D

IMEN

SIO

NS

OF

PLAI

N

AND

SLO

TTED

H

EX

WAS

HER

H

EAD

M

ACH

INE

SCR

EWS

s v)

Nom

inal

Size

or

Basic

Scre

w

Diam

eter

Widt

h

Acro

ss

Flats

A

[Not

e E4

1

Widt

h

Acro

ss

Corne

rs

W,

Min.

Head

W

ashe

r

Heigh

t Di

amete

r

H 8

Was

her

-. .

I m

ctmes

s *

* IJ

Slo

t W

idth

I

J r-s

I_

,3

wore

tiJ

1 -

Slo

t 5

Protr

usion

De

pth

Beyo

nd

z T

[Not

es (

I).

(711

Ga

ging

Ring

F,

Min.

4 5

[Not

e (4

11

Max

. M

in.

[Not

es

(51.

(6

)l M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

M

ax.

Min.

[N

ote

WI

i%

2 0.

0860

0.

125

0.12

0 0.

134

0.05

0 0.

040

0.16

6 0.

154

0.01

6 0.

010

0.02

4 z

. 3

0.09

90

0.12

5 0.

120

0.13

4 0.

055

0.04

4 0.

177

0.16

3 0.

016

0.01

0 0.

026

z .

. .

s

4 0.

1120

0.

188

0.18

1 0.

202

0.06

0 0.

049

0.24

3 0.

225

0.019

0.

011

0.03

9 0.

031

0.04

2 0.

025

0.02

9 E

5 0.

1250

0.

188

0.18

1 0.

202

0.07

0 0.

058

0.26

0 0.

240

0.02

5 0.

015

0.04

3 0.

035

0.04

9 0.

030

0.03

5 2

6 0.

1380

0.

250

0.24

4 0.

272

0.09

3 0.

080

0.32

8 0.

302

0.02

5 0.

015

0.04

8 0.

039

0.05

3 0.

033

0.04

8

8 0.

1640

0.

250

0.24

4 0.

272

0.11

0 0.

096

0.34

8 0.

322

0.03

1 0.

019

0.05

4 0.

045

0.07

4 0.

052

0.05

8

10

0.19

00

0.31

2 0.

305

0.34

0 0.

120

0.10

5 0.

414

0.38

4 0.

031

0.01

9 0.

060

0.05

0 0.

080

0.05

7 0.

063

12

0.21

60

0.31

2 0.

305

0.34

0 0.

155

0.13

9 0.

432

0.39

8 0.

039

0.02

2 0.

067

0.05

6 0.

103

0.07

7 0.

083

‘A,

0.25

00

0.37

5 0.

367

0.40

9 0.

190

0.17

2 0.

520

0.48

0 0.

050

0.03

0 0.

075

0.06

4 0.1

11

0.08

3 0.

103

5/6

0.31

25

0.50

0 0.

489

0.54

5 0.

230

0.20

8 0.

676

0.62

4 0.

055

0.03

5 0.

084

0.07

2 0.

134

0.10

0 0.

125

“/8

0.37

50

0.56

2 0.

551

0.61

4 0.

295

0.27

0 0.

780

0.72

0 0.

063

0.03

7 0.

094

0.08

1 0.

168

0.13

1 0.

162

GEN

ERAL

NO

TES:

(a

) Fo

r ad

ditio

nal

requ

irem

ents

refe

r to

pa

ra.

2.

(b)

For

refe

renc

e,

see

Tabl

e 15

Illu

stra

tion

on

prev

ious

page

.

NOTE

S:

(1)

Unle

ss

othe

rwise

sp

ecifie

d by

pu

rcha

ser,

hex

wash

er

head

m

achi

ne

scre

ws

are

not

slotte

d.

(2)

Fille

t ra

dius

R

at

junc

tion

of

side

s of

he

x an

d to

p of

wa

sher

sh

all

not

exce

ed

0.15

tim

es

the

basi

c sc

rew

diam

eter

. (3

) A

slig

ht

roun

ding

of

all

edge

s an

d co

rner

s of

th

e he

x su

rface

s sh

all

be

perm

issib

le.

(4)

Whe

re

spec

ifyin

g no

min

al

size

in

decim

als,

ze

ros

prec

edin

g de

cimal

an

d in

th

e fo

urth

de

cimal

pl

ace

shal

l be

om

itted

. (5

) Di

men

sions

ac

ross

fla

ts

and

acro

ss

corn

ers

of

the

head

sh

all

be

mea

sure

d at

th

e po

int

of

max

imum

m

etal

. Ta

per

of

side

s of

he

x (a

ngle

betw

een

one

side

and

the

axis)

sh

all

not

exce

ed

2”

or

0.00

4 in

., wh

ichev

er

is g

reat

er,

the

spec

ified

widt

h ac

ross

fla

ts

bein

g th

e la

rge

dim

ensio

n.

(6)

The

roun

ding

due

to

lack

of

fil

l on

al

l six

co

rner

s of

th

e he

ad

shal

l be

re

ason

ably

unifo

rm

and

the

widt

h ac

ross

co

rner

s of

th

e he

ad

shal

l be

su

ch

that

wh

en

a sh

arp

ring

havin

g an

in

side

diam

eter

eq

ual

to

the

spec

ified

min

imum

wi

dth

acro

ss

corn

ers

is p

lace

d on

th

e to

p of

th

e he

ad,

the

hex

porti

on

of

the

head

sh

all

prot

rude

by

an

am

ount

eq

ual

to,

or

grea

ter

than

, th

e Fv

alue

tabu

late

d.

See

Appe

ndix

II fo

r ac

ross

co

rner

s ga

ging

of

he

x he

ads.

(7

) Sl

ot

dept

h be

yond

bo

ttom

of

in

dent

atio

n sh

all

not

be

less

th

an

one-

third

of

th

e m

inim

um

slot

de

pth

spec

ified.


STDmASHE BLB-6.3-ENGL 1998 0759b70 Ob14242 259


"7

A Note (1)

/ 30" \ -Optional [Note (3)1

TABLE 16 DIMENSIONS OF SQUARE AND HEX MACHINE SCREW NUTS

Nominal Size or Basic Thread

Diameter

Width Across Width Across Corners Thickness Flats F Square G Hex G1 H

[Note 1411 Basic Max. Min. Max. Min. Max. Min. Max. Min.

O 0.0600 732 O. 156 0.1 50 0.221 0.206 0.180 0.171 0.050 0.043 1 0.0730 5/32 O. 156 0.150 0.221 0.206 0.180 0.171 0.050 0.043 2 0.0860 'i1 6 O. 188 0.180 0.265 0.247 0.217 0.205 0.066 0.057 3 0.0990 'i1 6 O. 188 0.180 0.265 0.247 0.217 0.205 0.066 0.057

4 0.1120 l h 0.250 0.241 0.354 0.331 0.289 0.275 0.098 0.087 5 0.1250 y1 6 0.312 0.302 0.442 0.415 0.361 0.344 0.114 0.102 6 0.1380 5

11 6 0.312 0.302 0.442 0.415 0.361 0.344 0.114 0.102

8 0.1640 11 132 0.344 0.332 0.486 0.456 0.397 0.378 O. 130 0.117

10 0.1900 "8 0.375 0.362 0.530 0.497 0.433 0.413 O. 130 0.117 12 0.2160 '4 6 0.438 0.423 0.619 0.581 0.505 0.482 0.161 0.148

'/* 0.2500 '11 6 0.438 0.423 0.619 0.581 0.505 0.482 0.193 O. 178 '/,6 0.3125 6 0.562 0.545 0.795 0.748 0.650 0.621 0.225 0.208

'/a 0.3750 "/B 0.625 0.607 0.884 0.833 0.722 0.692 0.257 0.239

GENERAL NOTE: For additional requirements refer to para. 2. NOTES: . ".

Square machine screw nuts shall have tops and bottoms flat, without chamfer. The bearing surface shall be perpendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg. Hexagon machine screw nuts shall have tops flat with chamfered corners. Diameter of top circle shall be equal to the maximum width across flats within a tolerance of minus 15%. The bearing surface shall be perpendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg. Bottoms of hexagon machine screw nuts are normally flat, but for special purposes may be chamfered, if so specified by purchaser. Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

70


STD-ASME BLB-b-3-ENGL L998 M 0759b70 Ob14243 L95 m


\ 40' I I '

TABLE 17 DIMENSIONS OF HEADER POINTS FOR MACHINE SCREWS BEFORE THREADING

Nominal Nominal Size 'Oint Screw Length

or Basic Screw Threads Diameter L. Diameter Per [Note (211 Inch Max. Min. [Note (311

P Max.

2 0.0860

4 0.1120

5 0.1250

6 0.1380

8 0.1640

10 0.1900

12 0.2160

'/4 0.2500

5/16 0.3125

'/a 0.3750

'/le 0.4375

'/* 0.5000

56 64

40 48

40 44

32 40

32 36

24 32

24 28

20 28

18 24

16 24

14 20

13 20

0.057 0.050 0.060 0.053

0.074 0.065 0.079 0.070

0.086 0.076 0.088 0.079

0.090 0.080 0.098 0.087

0.114 0.102 0.118 0.106

0.125 0.112 0.138 0.124

0.149 0.134 0.156 0.141

0.170 0.153 0.187 0.169

0.221 0.200 0.237 0.215

0.270 0.244 0.295 0.267

0.316 0.287 0.342 0.310

0.367 0.333 0.399 0.362

ASME 818.6.3-1998

GENERAL NOTE: For additional requirements refer t o para. 2. NOTES: (1) Edges of point may be rounded and end of point need

not be flat nor perpendicular to axis of shank. (2) Where specifying nominal size in decimals, zeros

preceding decimal and in the fourth decimal place shall be omitted.

(3) Header points apply to these nominal lengths or shorter. The pointing of longer lengths may require machining to the dimensions specified.

71


ASME 818.6.3-1998

MANDATORY APPENDIX I PROTRUSION GAGING OF FLAT COUNTERSUNK HEADS

Suitability of flat countersunk head screws, except the No. 0000, No. 000, and No. 00 sizes, and undercut flat countersunk head screws, except the No. 0 and No. 1 sizes, for application in countersinks designed to the principal dimensions of the screws may be determined by the use of a protrusion gage as illustrated i n Fig. I I .

Head angle

rF

thickness optlonal

t I l

FIG. Il PROTUSION GAGE

The gaging dimensions and the gage diameters are specified in the dimensional tables for flat countersunk head and undercut tlat countersunk head screws. The protrusion limits shown in the tables shall apply only when the gaging diameter is exactly as indicated with the gaging edge o f a sharpness obtained by lapping the hole and the top surface of the gage. Any variation in the gaging diameter will require recalculation o f protrusion values by the original formulas given below:

Maximum

M a x . F = Max. sharp head diameter - gage hole diameter

2

x ta11 YO" - i 2 i Min . head angle

Minimum protrusion:', '

Min. F = Min. sharp head diameter - gage hole diatnter

2

i x tan 90" - Max. head angle 2

or correction of protrusion in accordance with the following formula:

F = F - A - C' A - G

where F = F = A =

G = G' =

tabulated protrusion value corrected protrusion value head diameter (manimum or minimum for maximum or minimum protrusion, respectively) tabulated gage diameter measured gage diameter

To insure adequate service life, the protrusion gage should be made of tool steel having a hardness of not less than 60 Rockwell C (60 HRC).

' Protrusion values shown in dimensional tables were calculated from these formulas and rounded to the nearest 0.001 in., upward for the maximum and downward for the minimum.

' See formulas for maximum and minimum sharp head diameters in Appendix V.

73 Previous page


ASME 818.6.3-1998

MANDATORY APPENDIX II ACROSS-CORNERS GAGING OF HEX HEADS

Suitability of across-corners dimensions of hex head and hex washer head screws may be determined by the use of gaging rings as described below.

When the gaging ring is placed on the top of a hex or hex washer head screw. and also the bottom of a hex head screw, at right angles to the axis of the screw, the head (hex portion of washer head) must protrude beyond the ring by an amount equal to 60% of the minimum head height H . For convenience, the minimum protrusion values are given i n the dimensional tables for hex and hex washer head screws.

The gaging ring shall have an inside diameter equal to the tabulated minimum width across corners, within a tolerance of plus 0.0003 in . The gaging edges of the ring shall be sharp and opposite faces shall be parallel. To insure adequate service life. the ring should be made of tool steel and have a hardness of not less than 60 Rockwell C.

A typical gaging fixture is shown i n Fig. I I I with an explanation of its application; however. any equivalent means may bc used.

To check hex head screws from the top, an initial reading shall be taken with the gaging ring placed on the indexing plate. Then, with the screw placed in the tixture, the gaging ring shall be placed on top of the screw head and a second reading taken. The difference between the two readings is equal to the protrusion F of the head beyond the gaging ring.

To check hex washer head screws, the gaging proce- dure shall be exactly the same as that for checking hex head screws from the top. However, in this case the difference X between the two readings includes the washer thickness and it is necessary to deduct the actual (measured) thickness of the washer portion from the difference X to obtain the protrusion F of the hex beyond the gaging ring.

Gaging the bottom of the head on hex head screws may be accomplished in the same manner as gaging the top, except the ring is placed below the head. The same protrusion values shall apply.

y Special micrometer body

F;- Must be parallel

ickness ptional

L Diameter 4 optional

Gaging Ring

Indexing plate with slots for screws

Gaging Hex Head From Top

Gaging Hex Washer Head

FIG. 111 TYPICAL GAGING FIXTURE

15 Previous page


ASME 818.6.3-1998

MANDATORY APPENDIX 111 PENETRATION GAGING OF RECESSED HEADS

Penetration gaging is a test to determine the suitability o f recesses i n the heads of screws and may be used to indicate deficiencies in the dimensions of the recesses specified i n the dimensional tables. Penetrations that are too deep indicate the possibility of a thin section between head and shank of screw, a weakness that might result in twisting-off screw heads during tightening of the screws. Use of screws having shallow penetrations might result i n production problems such as reaming of recesses or excessive wear on driver bits.

Penetration gaging depth values for the various styles of recessed heads are included in the dimcnsional tables for the respective heads. These values were predicated originally on the gaging of plain tinish (unplated or uncoated) screws. However, subsequent experience has shown that the Type I and Type I I recess penetration limits as tabulated, and the Type IA recess penetration depths with tabulated minimum limit reduced by up to 0.005 in., are suitable for the gaging of screws having coating thickness of up to and including 0.0003 in. on signiticant surfaces.

Screws having heavier coatings, which fail to meet the penetration gaging requirements, must be stripped of finish and gaged for acceptance or rejection in the plain condition.

Specified in Tables 1111, 1112, and III3 are dimensions of gage points to be used for penetration gaging the Type I, Type IA, and Type I1 recesses. Gage points approach as nearly as possible the perfect driver form. Also specified are gage heads and bushings, which adapt the gage points to standard dial gages.

Penetration is gaged relative to a reference plane defined by the intersection of the edge of the recess wings with the top surface of the screw head. This plane is the same as the top surface of a flat head screw, but is somewhat below the topmost portion of heads that have rounded top surfaces. Knife edges or tapered ridges on the gage head are used to establish the reference plane. A reverse reading dial gage is used to indicate the penetration of the gage point into the recess. The gage may be zeroed on any flat surface.

77 Previous page


Stan

dard

di

al

gage

ex

cept

nu

mer

als

read

ing

coun

ter-

i--

0.87

59

+=I

fO.8

751

/--

I= -

1

0.54

6

-Set

sc

rew

Gage

he

ad

(in

sect

ion)

Gage

po

int

Scre

w -

Bush

ing

for

No.

5 Ga

ge

Head

r--l

.0.2

50

0.24

5

JX

LD

Sect

ion

X-X

Tole

ranc

e tO

.005

un

less

ot

herw

ise

spec

ified

Gage

He

ad

Dim

ensio

ns

of

Gage

He

ads

Size

of

A,

Rece

ss

Gage

TO

.002

No.

0 0.

008

No.

1 0.

012

No.

2 0.

018

No.

3 0.

022

No.

4 0.

031

No.

5 0.

041

B,

C,

Q

E F,

G

kO.00

3 *0

.000

2 *O

.OOl

*0

.005

AO

.005

kO

.005

0.01

5 0.

0460

0.

377

0.56

2 1.

688

1.12

6 0.

020

0.08

80

0.37

7 0.

562

1.68

8 1.

126

0.03

1 0.

1420

0.

377

0.56

2 1.

688

1.12

6 0.

037

0.21

00

0.37

7 0.

562

1.68

8 1.

126

0.06

2 0.

3130

0.

377

0.56

2 1.

688

1.12

6 0.

094

0.50

10

0.55

0 0.

750

1.89

6 1.

134

Gage

Po

int

in

Zero

Ga

ge

Poin

t in

G

aging

Po

sitio

n Po

sitio

n

Pene

tratio

n Ga

ge

TABL

E 11

11 I

LLU

STR

ATIO

N


L G

rind

squa

re

with

ax

is

Gage

Po

int

All

othe

r siz

es

Half

Sect

ion

Y-Y

Enlar

ged

Point

De

tail

TABL

E 11

11 D

IMEN

SIO

NS

OF

GAG

E PO

INTS

Point

Po

int

Widt

h W

ing

Millin

g

Widt

h An

gle

Size

of

Point

B.

Le

ngth

Leng

th Th

ickne

ss F

G.

H.

Flat

on

End

Rece

ss

Dia.

A,

+a.o

ooo

c,

0.

Dia.

E,

+0.00

10

0”

+oo

J

Gage

*0

.000

2 -0

.001

0 ~0

.005

kO

.005

iO.0

05

Max

. M

in.

-0.00

00

00

-15’

Max

. M

in.

No.

0 0.

0450

0.

0240

0.

656

0.78

1 0.

094

0.01

2 0.

010

0.03

20

7"

00'

0.01

5 0.

010

No.

1 0.

0870

0.

0394

0.

688

0.81

2 0.

156

0.02

0 0.

018

0.05

00

7"

00

0.02

0 0.

015

No.

2 0.

1410

0.

0606

0.

750

0.87

5 0.

219

0.02

5 0.

023

0.09

00

5O 4

5 0.

020

0.01

5 No

. 3

0.20

90

0.09

83

0.78

1 0.

906

0.25

0 0.

031

0.02

9 0.

1500

5"

45

' 0.

020

0.01

5 No

. 4

0.31

20

0.14

07

0.84

4 0.

969

0.35

9 0.

044

0.04

2 0.

2000

7"

00

0.

020

0.01

5 No

. 5

0.50

00

0.23

10

1.03

1 1.

156

0.53

1 0.

063

0.06

1 0.

3110

7O

00

0.02

5 0.

020

GEN

ERAL

NO

TE:

For

addi

tiona

l re

fere

nce,

se

e Ta

ble

Ill1

Illust

ratio

n on

pr

eviou

s pa

ge.

NOTE

S:

(1)

Base

of

flu

te

on

size

No.

0 ha

s 0.

0090

to

0.

0109

in

. ra

dius

. (2

) To

lera

nce

on

size

No.

0 is

pl

us

0.00

00

and

min

us

0.00

26

in.

Base

Flu

te Sid

e Flu

te

Angle

K,

An

gle

L,

0’ +1

5 00

+1

5’

00

-00

00

-00’

[Not

e (1

)I

92”

00’

138'

00

92"

00

140"

00

' 92

" 00

14

6“

00

92"

00'

153"

00

' 92

" 00

' 16

2"

46

92"

00

Flute

Widt

h at

Botto

m

M,

+o.oo

oo

-0.00

10

0.01

51

[Not

e (2

)1

0.02

02

0.04

34

0.08

26

0.10

78

0.17

30


Size

of

Rece

ss

Gage

Stan

dard

di

al

gage

ex

cept

nu

mer

als

read

ing

coun

ter-

kO.8

751

/-----

F

-1

-Set

sc

rew

Gage

he

ad

(in

sect

ion)

Gage

po

int

Scre

w -

Bush

ing

for

No.

5 Ga

ge

Head

To

lera

nce

+0.0

05

unle

ss

othe

rwise

sp

ecifie

d.

Gage

He

ad

Dim

ensio

ns

of

Gage

He

ads

Size

of

A,

B,

c,

D,

6

F,

G,

Rece

ss

Gage

io

.002

io

.003

*0

.000

2 *O

.OOl

zto

.005

*0

.005

*0

.005

No.

0 0.

008

0.01

5 0.

0460

0.

377

0.56

2 1.

688

1.12

6 No

. 1

0.01

2 0.

020

0.08

80

0.37

7 0.

562

1.68

8 1.

126

No.

2 0.

018

0.03

1 0.

1420

0.

377

0.56

2 1.

688

1.12

6 No

. 3

0.02

2 0.

037

0.21

00

0.37

7 0.

562

1.68

8 1.

126

No.

4 0.

031

0.06

2 0.

3130

0.

377

0.56

2 1.

688

1.12

6 No

. 5

0.04

1 0.

094

0.50

10

0.55

0 0.

750

1.89

6 1.

134

Gage

Po

int

in

Zero

Ga

ge

Poin

t in

G

aging

Po

sitio

n Po

sitio

n

Pene

tratio

n Ga

ge TA

BLE

1112

DIM

ENSI

ON

S O

F G

AGE

POIN

TS

Poin

t Di

amet

er

A.

io.o

oo2

Point

W

idth

B

(at

Base

of

Ra

dius

R)

Max

. M

in.

Leng

th c,

*0.0

05

Leng

th

0,

io.0

05

Diam

eter

f. f0

.005

No.

0 0.

0450

0.

0280

0.

0265

0.

656

0.78

1 0.0

94

No.

1 0.

0870

0.

0438

0.

0423

0.

688

0.81

2 0.

156

No.

2 0.

1410

0.

0670

0.

0655

0.

750

0.87

5 0.

219

No.

3 0.

2090

0.

1020

0.

1005

0.

781

0.90

6 0.

250

No.

4 0.

3120

0.

1520

0.

1505

0.

844

0.96

9 0.

359

No.

5 0.

5000

0.

2420

0.

2400

1.

031

1.15

6 0.

531

Win

g Th

ickne

ss

Point

W

idth

F.

G.

+0.00

10

+O.O

Ol

-0.O

OOQ

-0.00

0

0.01

65

0.03

5 0.

0265

0.

054

0.03

80

0.09

5 0.

0530

0.

155

0.08

10

0.20

3 0.

0910

0.

315

= (co

ntinu

ed)

-


LGrin

d sq

uare

wi

th

axis

\ Se

ctio

n

Gage

Po

int

Enlar

ged

Point

De

tail

TABL

E 11

12 D

IMEN

SIO

NS

OF

GAG

E PO

INTS

(C

ON

T’D

)

Rib

Wing

Millin

g M

illing

Form

Fo

rm

Flat

00

Millin

g O

ffset

O

ffset

An

gle

Angle

on

Size

Angle

An

gle

Angle

L

M.

Wing

W

ing

End

of

H,

J,

K 0”

+0

7 00

+07

O

ffset

O

ffset

p.

Ra

dius

Rece

ss

00

+oo

0”

+06’

00

+06

0”

-00

00

-00

Angle

An

gle

+0.0

05

R

Gage

Oq

-06

0’

-0

0 0’

-0

0 [N

ote

11)1

N

ote

(111

N

NT

-0

.000

M

ax.

Min.

No.

0 7”

00

’ 4”

23

’ 70

45’

46

” 00

’ 46

” 00

’ 22

’ 2”

00

’ 0.

010

0.00

4 0.

003

No.

1 7”

00

’ 4”

23

’ 7O

45

46”

00’

46”

00’

22’

20

00’

0.01

5 0.

005

0.00

4 No

. 2

5”

45

3”

00

6”

20’

46”

00’

46”

00’

17’

2”

04’

0.01

5 0.

008

0.00

6 No

. 3

5”

45

3”

00’

6”

20

56”

15’

46”

00’

17’

2”

04’

0.01

5 0.

012

0.00

8

No.

4 7O

00’

4”

23

’ 7”

45

56

” 15

’ 46

” 00

22

’ 2”

00

’ 0.

015

0.02

0 0.

014

No.

5 7”

00

4’

23

’ 7O

45

56’

15’

46”

00’

22’

2”

00

0.02

0 0.

040

0.03

5

NOTE

: (I)

Th

ese

dim

ensio

ns

are

mea

sure

d no

rmal

to

the

milli

ng

cut.


Bush

ing

-Sta

ndar

d di

al

gage

Bush

ing

num

eral

s re

ading

clo

ckwi

se

Gage

he

ad

(in

sect

ion)

Gage

po

int

in

zero

po

sitio

n

Pene

tratio

n Ga

ge

Gage

po

int

f-0.8

75-j

c 1.

875

-j

Cl

r’,/4

-20

UNC-

2B

JX

45”

b)‘

Tole

ranc

e +0

.005

un

less

Se

ctio

n X-

X

othe

rwise

sp

ecifie

d Ga

ge

Head

exce

pt

coun

ter-

Dim

ensio

ns

of

Gage

He

ads

A B

c D

E Ga

ge

. Di

amet

er

to.0

02

+0.0

02

~0.0

001

io.0

05

kO.00

5 -o

oo

o -0

.000

0.09

3 0.

09

30

0.34

4 0.

375

0.0

30

0.02

4 0.

141

0.14

10

0.

375

0.43

8 0.

046

0.03

6 0.

246

0.24

60

0.50

0 0.

500

0.06

2 0.

05

1 0.

436

0.43

60

0.68

8 0.

562

0.09

4 0.

078

TABL

E 11

13

ILLU

STR

ATIO

N


Gage

Po

int

Enla

rged

Po

int

Deta

il

Half

Sect

ion

Y-Y

.

TABL

E 11

13

DIM

ENSI

ON

S O

F G

AGE

POIN

TS

Gage

Di

amet

er

0.09

3 0.

141

0.24

6 0.

436

Poin

t

Dia.

A,

*0.0

001

0.09

26

0.14

06

0.24

56

0.43

56

Dia.

Le

ngth

Le

ngth

6.

C,

0,

*0.0

05

3zo.

005

*0.0

05

0.18

8 0.

750

0.87

5 0.

250

0.87

5 1 .

ooo

0.31

2 0.

938

1.06

2 0.

469

1.12

5 1.

250

Poin

t W

idth

E.

+O.O

Ol

-0.0

00

0.02

7 0.

027

0.02

7

0.02

7

Flat

Ra

dius

on

End

G.

E +o

.ooo

10

.002

-0

.001

0.06

2 0.

005

0.06

2 0.

005

0.06

2 0.

005

0.06

2 0.

005

Milli

ng

Angl

e H,

0”

+05’

0”

-0

0

8”

45’

8”

45

8”

45

8”

45’

Side

Fl

ute

Angl

e J.

0”

+15

00

-00

90”

00

90”

00

90”

00

90”

00’

GEN

ERAL

NO

TES:

(a

) Al

thou

gh

thes

e ga

ges

may

be

us

ed

inte

rcha

ngea

bly,

sh

owin

g id

entic

al

read

ings

on

th

ose

sizes

of

sc

rews

wh

ere

dim

ensio

n B

of

gage

he

ad

is g

reat

er

than

th

e re

cess

dia

met

er,

the

follo

wing

re

com

men

datio

ns

may

be

ap

plie

d:

use

0.09

3 ga

ge

for

rece

ss

diam

eter

s up

to

0.

150

in.

(it

is n

ot

prac

tical

to

ga

ge

scre

w siz

es

No.

0 an

d No

. 1

havin

g re

cess

di

amet

ers

of

less

th

an

0.10

2 in

. m

axim

um);

use

0.14

1 ga

ge

for

rece

ss

diam

eter

s of

0.

150

and

up

to

0.27

0 in

.; us

e 0.

246

gage

fo

r re

cess

di

amet

ers

of

0.27

0 an

d up

to

0.

460

in.;

and

use

0.43

6 ga

ge

for

rece

ss

diam

eter

s of

0.

460

and

up

to

0.70

0 in

. (b

) Fo

r ad

ditio

nal

refe

renc

e,

see

Tabl

e III

3 Illu

stra

tion

on

prev

ious

page

.


STD*ASME BLB.b.3-ENGL L998 W 0759b70 Ob14253 034 m

ASME 818.6.3-1998

MANDATORY APPENDIX IV WOBBLE GAGING OF RECESSED HEADS

Wobble gaging provides a means for determining thc compatibility of cross recesses in the heads of screws with companion screw drivers, and will indicate the point where deviations in the recess contours affect satisfactory driver engagement. Recesses that exhibit excessive wobble characteristics will result in poor screw driveability because of driver camout prior to attaining normal torque level, damage to recesses, and/ or accelerated driver wear.

The allowable total wobble gaging limits for the various types of recesses included herein were predicated originally on the gaging of plain finish (unplated or uncoated) screws. However, subsequent experience has shown these limits to be suitable for the gaging of screws having coating thickness up to and including 0.0003 i n . on significant surfaces. Screws having heavier coatings that fail to meet the wobble gaging requirements must be stripped o f finish and gaged for acceptance or rejection in the plain condition.

Wobble gaging fixtures, as illustrated in Table IVI, and appropriate cross recess master plug gages with handles and position indicators for the respective recess types are available through the screw suppliers. Dimen- sions of the points on master plug gages are, except for the body diameters tabulated herein, the same as those specified for the respective gage points in Appendix I I I .

The screw to be gaged shall be placed into the screw-holding chuck and oriented such that one set of recess wings is parallel to the upright back plate. The screw shall be so positioned and the chuck shall be tightened sufficiently to prevent any tilting of the screw in the chuck when taking wobble readings.

The position gage pointer and handle with the proper master plug gage for the recess size being checked shall be positioned in the slot of the degree scale on the top plate and the point of the plug gage inserted into the screw recess. I t is essential that registry between the cross lines of pointer and the recess wings be maintained. To correct any misalignment, the chuck position lock screw is loosened, the chuck is rotated until registry is obtained, and the chuck is raised or lowered unt i l the gage pointer is flush with the top of the degree scale. The chuck position lock screw is then tightened and the readings taken. The gage handle, with downward pressure applied, is moved from side to side unt i l resistance is encountered and the total reading between points of travel of the gage pointer is recorded. The allowable angular wobble limits shall not exceed the values tabulated in Tables IV2 and IV3. Cross lines on the gage pointer should be rechecked with plug gage wings to make certain cross lines and gage wings are registered on identical radials.

85 Previous page


ASME 818.6.3-1998

Back plate 1 Plug gage handle and pointer %

Cross recess master Plug gage

Gage body diameter -

Cross recess screw mounted in chuck ”-

Chuck for holding

Screw \

Top plate with degree scale calibrated on basis of 4.250 in. radius

MANDATORY APPENDIX IV

y Cross lines on end of pointer

Chuck position lock screw

FIG. IV1 WOBBLE GAGING FIXTURE

86


STDmASME B18.6-3-ENGL L998 m 0759b70 Ob14255 907 m

MANDATORY APPENDIX IV

TABLE IV1 GAGE BODY DIAMETERS

ASME 818.6.3-1998

Size of Type I Recess Type IA Recess

Recess Ground Gage Ground Gage Pressed Gage

Gage Max. Min. Max. Min. Max. Min.

No. O 0.135 0.115 0.135 0.115 . . . . . . No. 1 0.198 0.178 0.198 0.178 0.275 0.255 No. 2 0.260 0.240 0.260 0.240 0.275 0.255 No. 3 0.323 0.303 0.323 0.303 0.370 0.350 No. 4 0.385 0.365 0.385 0.365 0.475 0.455 No. 5 0.760 0.740 0.760 0.740 . . . . . .

GENERAL NOTE: Diameters of Type II recess gages are same as penetration gage points in Appendix 111.

TABLE IV2 GAGING LIMITS FOR TYPE I AND TYPE IA RECESSES

Size of Recess Wobble, deg

Maximum Allowable Total

Gage Type I Type IA

No. O No. 1 15 12 No. 2 12 10 No. 3 10 8 No. 4 10 8 No. 5 10 8

. . . . . .

TABLE IV3 GAGING LIMITS FOR TYPE II RECESS

~~~

Recess Gage

Diameter Maximum Allowable Total Wobble, deg

0.093 12 0.141 10 0.246 8 0.436 6

87


STD-ASME BL8.6.3-ENGL L998 m 0759670 Ob14256 843 m

ASME 818.6.3-1998

MANDATORY APPENDIX V DIMENSIONS FOR NO. 0000, NO. 000, AND NO. O0 THREAD SIZES

The following dimensional data for the No. 0000, No. 000, und No. 00 thread sizes is provided in Table V I for convenient reference until such time as these thread sizes may be adequately documented in an appropriate standard relating specifically to screw threads.

and Threads Per Inch Series Major Diameter Pitch Diameter

Minor Dia-

[Note (111 Designation Class Allowance Max. Min. Max. Min. TOI. meter

0000-160 or NS 2 0.0000 0.0210 0.0195 0.0169 0.0158 0,0011 0.0128 0.0210-160

000-120 or NS 2 ~ . ~ o ~ ~ 0.0340 0.0325 0.0286 0.0272 0.0014 0.0232 0.0340-120

00-90 or NS 2 0 . ~ 0 0 0 0.0470 0.0450 0.0398 0.0382 0.0016 0.0326 0.0470-90

00-96 or NS 2 ~.~~~~ 0.0470 0.0450 0.0402 0.0386 0.0016 0.0334 0.0470-96

Internal Nominal Size and Threads Minor Diameter

Per Inch Series ~~ [Note (211 Pitch Diameter Diameter, Major

[Note (111 Designation Class Min. Max. Min. Max. TOI. Min.

0000-160 or NS 2 . . . 0.02 10-1 60

. . 0.0169 0.0181 0.0012 0.0210

000-120 or NS 2 . . . . . . 0.0286 0.0300 0.0014 0.0340 0.0340-120

00-90 or NS 2 . . . . . . 0.0398 0.0414 0.0016 0.0470 0.0470-90

00-96 or NS 2 . . . . . . 0.0402 0.0418 0.0016 0.0470 0.0470-96

NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place

shall be omitted. (2) The minor diameter limits for internal threads are not specified; they are determined by the amount

of thread engagement necessary to satisfy the strength requirements and tapping performance in the intended application.

89 Previous page


STD.ASME B18-6-3-ENGL L998 m 0759b70 Ob14257 78T m

ASME 818.6.3-1998

NONMANDATORY APPENDIX A FORMULAS FOR DIMENSIONS

Formulas for the dimensions of head diameter, head height, and slot depth for various types of head crews are provided in Tables Al through A14.

Formulas for dimensions of square and hex nuts are provided in Table A15.

TABLE A I FLAT COUNTERSUNK HEAD SCREWS

Screw Size Head Diameter

O000 thru O0 No formulas; see tables

O thru 'I0

'4 6

Max. A (sharp) = 2.040 D - 0.003 ref. [Note (1)l Min. A (sharp) = 1.960 D - 0.013 ref. [Note (1)l Max. A (rounded or flat) = 1.920 D - 0.003 [Note (211 Min. A (rounded or flat) = 1.820 D - 0.013 [Note (2)l Gaging diameter G = 1.830 D - 0.033

Max. A (sharp) = 2.000 D - 0.063 ref. [Note (1)1 Min. A (sharp) = 1.920 D - 0.073 ref. [Note (1)l Max. A (rounded or flat) = 1.880 D - 0.063 [Note (211 Min. A (rounded or flat) = 1.800 D - 0.073 [Note (2)l Gaging diameter G = 1.790 D - 0.093

'I2 t h r u '4 Max. A (sharp) = 2.000 D - 0.125 ref. [Note (lb1 Min. A (sharp) = 1.920 D - 0.135 ref. [Note (1)l Max. A (rounded or flat) = 1.880 D - 0.125 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.135 [Note (2)l Gaging diameter G = 1.790 D - 0.155

Screw Size Head Height Slot Depth

O000 thru O0 No formulas; see tables No formulas; see tables

O thru 'I0 Max. H = 0.619 D - 0.002 Max. T = 0.288 D - 0.002 Min. H = 0.552 D - 0.007 ref. [Note (1)l Min. J = 0.192 D - 0.002

'4 6 Max. H = 0.596 D - 0.038 Max. T = 0.274 D - 0.017 Min. H = 0.529 D - 0.042 ref. [Note ( l b 1 Min. T = 0.184 D - 0.015

'/> th r u Max. H = 0.596 D - 0.075 Max. T = 0.274 D - 0.034 Min. H = 0.529 D - 0.078 ref. [Note (1)l Min. J = 0.184 D - 0.027

GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 2'/,% of the head diameter.

91 Previous page


STD-ASME B18-6-3-ENGL L998 W 0759670 Ob3'+258 bLb

ASME B18.6.3-1998 NONMANDATORY APPENDIX A

TABLE A2 UNDERCUT FLAT COUNTERSUNK HEAD SCREWS

Screw Size Head Diameter

O thru

'4

Max. A (sharp) = 2.040 D - 0.003 ref. [Note (1)l Min. A (sharp) = 1.960 D - 0.013 ref. [Note (1)l Max. A (rounded or flat) = 1.920 D - 0.003 [Note (2)l Min. A (rounded or flat) = 1.820 D - 0.013 [Note (211 Gaging diameter G = 1.830 D - 0.033

Max. A (sharp) = 2.000 D - 0.063 ref. [Note (111 Min. A (sharp) = 1.920 D - 0.073 ref. [Note ( I ) ] Max. A (rounded or flat) = 1.880 D - 0.063 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.073 [Note (2)l Gaging diameter G = 1.790 D - 0.093

Max. A (sharp) = 2.000 D - 0.125 ref. [Note (1)1 Min. A (sharp) = 1.920 D - 0.135 ref. [Note ( I ) ] Max. A (rounded or flat) = 1.880 D - 0.125 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.135 [Note (2)l Gaging diameter G = 1.790 D - 0.155

Screw Size Head Height Slot Depth

O thru Max. H = 0.432 D - 0.001 Max. T = 0.202 D - 0.001 Min. H = 0.386 D - 0.005 Min. T = 0.134 D - 0.001

'4 Max. H = 0.417 D - 0.026 Max. T = 0.192 D - 0.012 Min. H = 0.370 D - 0.029 Min. T = 0.129 D - 0.011

'12 Max. H = 0.417 D - 0.052 Max. T = 0.192 D - 0.024 Min. H = 0.370 D - 0.055 Min. T = 0.129 D - 0,019

GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 2'4% of the head diameter.

TABLE A3 100 deg FLAT COUNTERSUNK HEAD SCREWS

Screw Size Head Diameter Head Height Slot Depth

O000 No formulas; see tables thru O0

No formulas; see tables No formulas; see tables

O Max. A (sharp) = 2.040 D - 0.003 ref. Max. H = 0.444 D - 0.001 Max. T = 0.222 D - 0.0005 thru [Note (lb1 Min. H = 0.396 D - 0.005 ref. Min. T = 0.184 D - 0.004

Min. A (sharp) = 1.960 D - 0.013 ref. [Note (1)l

Max. A (rounded or flat) = 1.920 D - 0.003

Min. A (rounded or flat) = 1.800 D - 0.013

Gaging diameter G = 1.790 D - 0.033

[Note ( I ) ]

[Note (2)l

[Note (2)l

GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 2'/,% of the head diameter.

92


STD-ASME B18.b=3-ENGL L778 m 0757b70 Ob14259 552

NONMANDATORY APPENDIX A ASME 618.6.3-1998

TABLE A4 CLOSE TOLERANCE 100 deg FLAT COUNTERSUNK HEAD SCREWS Screw Size Head Diameter Head Height Slot Depth

O Max. A (sharp) = 2.040 D - 0.003 ref. Max. H = 0.444 D - 0.001 Max. T = 0.222 D - 0.0005

"8 Min. A (sharp) = 2.000 D - 0.009 ref. [Note (1)l thru [Note (111 Min. H = 0.396 D - 0.005 ref. Min. T = 0.184 D - 0.004

[Note (111

[Note (211

[Note (2)l

Max. A (rounded or flat) = 1.920 D - 0.003

Min. A (rounded or flat) = 1.800 D - 0.013

Gaging diameter G = 1.790 D - 0.033

GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1 ) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 21/2% of the head diameter.

TABLE A5 OVAL COUNTERSUNK HEAD SCREWS

Screw Size Head Diameter Total Head Height

O0 No formulas; see tables No formulas; see tables

O thru

'11 6

' /2 th r u '/'

Max. A (sharp) = 2.040 D - 0.003 ref. [Note ( l ) ] Max. O = 0.923 D + 0.001 Min. A (sharp) = 1.960 D - 0.013 ref. [Note ( l ) ] Min. O = 0.820 D - 0.008 Max. A (rounded or flat) = 1.920 D - 0.003 [Note (2)l Min. A (rounded or flat) = 1.820 D - 0.013 [Note (2)l Gaging diameter G = 1.830 D - 0.033

Max. A (sharp) = 2.000 D - 0.063 ref. [Note (111 Max. O = 0.896 D - 0.047 Min. A (sharp) = 1.920 D - 0.073 ref. [Note (1) l Min. O = 0.789 D - 0.050 Max. A (rounded or flat) = 1.880 D - 0.063 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.073 [Note (2)l Gaging diameter G = 1.790 D - 0.093

Max. A (sharp) = 2.000 D - 0.125 ref. Min. A (sharp) = 1.920 D - 0.135 ref. Max. A (rounded or flat) = 1.880 D - 0.125 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.135 [Note (2)l Gaging diameter G = 1.790 D - 0.155

Max. O = 0.896 D - 0.094 Min. O = 0.789 D - 0.094

-

Screw Size Head Side Height Slot Depth

O0 No formulas; see tables No formulas; see tables

O thru 3/s

'4 6

Max. H = 0.619 D - 0.002 Min. H = 0.552 D - 0.007 ref. [Note (1)l

Max. H = 0.596 D - 0.038 Min. H = 0.529 D - 0.042 ref. [Note (111

Max. T = 0.556 D - 0.003 Min. T = 0.460 D - 0.003

Max. T = 0.547 D - 0.029 Min. T = 0.466 D - 0.030

' /2 thru '/4 Max. H = 0.596 D - 0.075 Max. T = 0.547 D - 0.057 Min. H = 0.529 D - 0.078 ref. [Note (1)l Min. T = 0.466 D - 0.055

GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. ( 2 ) Values based on a sidewall of approximately 2'/2% of the head diameter.

93


ASME 818.6.3-1998

STD-ASME BL8*6.3-ENGL L798 0757b70 ObL42b0 274 W

NONMANDATORY APPENDIX A

TABLE A6 UNDERCUT OVAL COUNTERSUNK HEAD SCREWS (Same as Oval Countersunk Head Except as Shown Below)

Screw Size Total Head Height Head Side Height Slot Depth

O thru Max. O = 0.736 D + 0.002 Max. H = 0.432 D - 0.001 Max. T = 0.480 D - 0.001 Min. T = 0.402 D - 0.002 3 18 Min. 0 = 0.654 D - 0.006 Min. H = 0.386 D - 0.005 ref. [Note (1)l

'4 Max. O = 0.717 D - 0.035 Max. H = 0.417 D - 0.026

5; Max. O = 0.717 D - 0.071 Max. H = 0.417 D - 0.052

Max. T = 0.473 D - 0.023 Min. O = 0.630 D - 0.037 Min. H = 0.370 D - 0.029 ref. [Note (1)1 Min. T = 0.404 D - 0.023

Max. T = 0.473 D - 0.033 Min. O = 0.630 D - 0.071 Min. H = 0.370 D - 0.055 ref. [Note (I)] Min. T = 0.404 D - 0.033

GENERAL NOTES: (a) Formulas same as for oval countersunk head except as shown above. (b) D is the basic diameter of the screw. NOTE: (1) Values no longer tabulated; formulas are retained here for reference purposes only

TABLE A7 PAN HEAD SCREWS

Head Height

Screw Size Head Diameter Slotted Recessed Slot Depth

O000 No formulas; see tables No formulas; see tables . . . No formulas; see tables thru O0

O thru Max. A = 1.980 D - 0.003 Max. H = 0.550 D + 0.006 Max. H = 0.692 D + 0.002 Max. T = 0.350 D + 0.001 12 Min. A = 1.940 D - 0.012 Min. H = 0.520 D Min. H = 0.652 D - 0.003 Min. T = 0.300 D - 0.004

thru Max. A = 1.980 D - 0.003 Max. H = 0.550 D + 0.006 Max. H = 0.692 D + 0.002 Max. T = 0.293 D + 0.014 '12 Min. A = 1.940 D - 0.012 Min. H = 0.520 D Min. H = 0.652 D - 0.001 Min. T = 0.246 D + 0.008

74 Min. A = 2.000 D - 0.125 Min. H = 0.520 D Min. H = 0.652 D - 0.001 Min. T = 0.246 D + 0.008 thru Max. A = 2.100 D - 0.140 Max. H = 0.550 D + 0.006 Max. H = 0.692 D + 0.002 Max. T = 0.293 D + 0.014

GENERAL NOTE: D is the basic diameter of the screw.

TABLE A8 TRUSS HEAD SCREWS


O000 No formulas; see tables No formulas; see tables No formulas; see tables thru O0

O thru Max. A = 2.440 D - 0.015 Max. H = 0.620 D Max. T = 0.350 D + 0.001 12 Min. A = 2.360 D - 0.023 Min. H = 0.570 D - 0.005 Min. T = 0.300 D - 0.004

'14 Max. A = 2.000 D + 0.073 Max. H = 0.520 D + 0.020 Max. T = 0.293 D + 0.014

74 thru Min. A = 1.930 D + 0.063 Min. H = 0.470 D + 0.015 Min. T = 0.246 D + 0.008


Y4


NONMANDATORY APPENDIX A ASME 818.6.3-1998

TABLE A9 FILLISTER HEAD SCREWS Screw Size Head Diameter Total Head Height Slot Depth

O000 No formulas; see tables No formulas; see tables No formulas; see tables thru 1

2 thru Max. A = 1.670 D - 0.004 Max. O = max. H + max. F Max. T = 0.440 D - 0.001 10 Min. A = 1.610 D - 0.014 Min. O = min. H + min. F Min. T = 0.374 D - 0.007

% 6 Max. A = 1.000 D + 0.188 Max. 0 = max. H + max. F Max. T = 0.500 (min. O) + 0.010

3

Min. A = 0.940 D + 0.178 Min. O = min. H + min. F Min. T = max. T - 0.066 D - 0.005

'/* thru Max. A = 1.000 D + 0.250 Max. O = max. H + max. F Max. T = 0.500 (min. O) + 0.010 "4 Min. A = 0.940 D + 0.240 Min. O = min. H + min. F Min. T = max. T - 0.066 D - 0.005

Screw Size Head Side Height ~ ~~

Oval Height

O000 thru 1

2 thru 7 8

'/2 thru "4

No formulas; see tables

Max. H = 0.660 D + 0.005 Min. H = 0.622 D

Max. H = 0.550 D + 0.022 Min. H = 0.510 D + 0.017

Max. H = 0.550 D + 0.027 Min. H = 0.510 D + 0.022

No formulas; see tables

Max. F = 0.280 D - 0.003 Min. F = 0.240 D - 0.008

Max. F = 0.220 D + 0.006 Min. F = 0.180 D + 0.001

Max. F = 0.220 D + 0.008 Min. F = 0.180 D + 0.003

GENERAL NOTE: D i s the basic diameter of the screw.

TABLE AIO DRILLED FILLISTER HEAD SCREWS

Screw Size Head Diameter Total Head Height Head Side Height Oval Height

O thru Max. A = 1.670 D - 0.004 Max. O = max. H + max. F Max. H = 0.660 D + 0.005 Max. F = 0.280 D - 0.003 Min. A = 1.610 D- 0.014 Min. O = min. H + min. F Min. H = 0.645 D Min. F = 0.265 D - 0.008

~~~ ~ ~~


95


STD.ASME BLd.b.3-ENGL L998 D 0759670 ObL42b2 047 m

ASME 818.6.3-1998 NONMANDATORY APPENDIX A

TABLE A l l BINDING HEAD SCREWS

Screw Size Head Diameter Total Head Height Oval Height


O thru Max. A = 2.100 D Max. O = 0.700 D - 0.010 Max. F = 0.260 D - 0.004 Min. F = 0.200 D - 0.004 "8 Min. A = 1.990 D Min. O = 0.665 D - 0.014

Screw Size Slot Depth Undercut Diameter Undercut Depth


O thru Max. J = 0.460 D - 0.010 Max. U = 1.640 D Max. X = 0.100 D + 0.001 Min. X = 0.100 D - 0.004 78 Min. T = 0.390 D - 0.014 Min. U = 1.440 D


TABLE A12 ROUND HEAD SCREWS


O000 thru No formulas; see tables No formulas; see tables No formulas; see tables O 0

O thru Max. A = 1.887 D Max. H = 0.645 D + 0.014 Max. T = 0.367 D + 0.017 Min. T = 0.277 D + 0.013 "8 Min. A = 1.813 D - 0.010 Min. H = 0.615 D + 0.006

'4 6 Max. A = 2.000 D - 0.125 Max. H = 0.875 D - 0.055 Max. T = 0.498 D - 0.023 Min. A = 1.926 D - 0.135 Min. H = 0.845 D - 0.063 Min. T = 0.380 D - 0.018

Max. A = 2.000 D - 0.188 Max. H = 0.875 D - 0.082 Max. T = 0.498 D - 0.038 Min. A = 1.926 D - 0.198 Min. H = 0.845 D - 0.090 Min. T = 0.380 D - 0.031

and Max. A = 2.000 D - 0.250 Max. H = 0.875 D - 0.109 Max. T = 0.498 D - 0.053 Min. T = 0.380 D - 0.043 3/, Min. A = 1.926 D - 0.260 Min. H = 0.845 D - 0.117


96


TABL

E A

l3

FLAT

AN

D O

VAL

CO

UN

TER

SUN

K TR

IM

HEA

D

SCR

EWS

Oval

Head

Head

He

ight

H

for

All

Scre

w Siz

es

[Not

e (I)

1

Tota

l He

ad

Heigh

t fo

r He

ad

Radiu

s

All

Scre

w Re

f. fo

r Al

l

Size

s Sc

rew

Sizes

For

max

. H,

us

e m

ax.

shan

k dia

met

er

D,

min

. an

gle

80”

max

. he

ad

diam

eter

A,

and

nom

inal

ra

dius

f?

.

For

min

. H,

us

e m

ax.

shan

k dia

met

er

D,

max

. an

gle

82O

min

. he

ad

diam

eter

A,

an

d no

min

al

radi

us

R

Max

. 0

= No

m.

R =

max

. H

+ F

0.08

m

in.

A

Min.

0

= m

in.

H +

F

L

Flat

Head

Sh

ank

Head

Ov

al

Head

He

ight

H Sc

rew

Head

Di

a. 0,

Di

amete

r He

ight

for

All

Scre

w Siz

es

Size

Size

Max

. M

ax.

Min.

F,

Re

f.

max

. A

- D

Max

. ’

= 2(

tan

40”)

Min.

H

= ~~

~~nA

4~o~

re

f. [N

ote

(3)]

4 3

0.11

2 0.

187

0.16

7 0.

033

5 4

0.12

5 0.

212

0.19

1 0.

037

5 4

0.13

8 0.

212

0.19

1 0.

037

5 5

0.13

8 0.

237

0.21

5 0.

041

3 5

0.16

4 0.

237

0.21

5 0.

041

3 6

0.16

4 0.

262

0.23

8 0.

045

IO

8 0.

190

0.31

2 0.

285

0.07

6 12

a

0.21

6 0.

312

0.28

5 0.

076

12

10

0.21

6 0.

362

0.33

3 0.

060

/4

10

0.25

0 4

12

0.25

0 46

12

0.

3125

46

‘14

0.31

25

0.36

2 0.

412

0.41

2 0.

477

0.59

7

0.33

3 0.

380

0.38

0 0.

442

0.55

6

0.06

0 0.

068

0.06

8 0.

079

0.09

9 ‘8

%

6 0.

375

R i?

GEN

ERAL

NO

TE:

D is

th

e ba

sic

diam

eter

of

th

e sc

rew.

NOTE

S:

(1)

Dim

ensio

ns

have

be

en

dete

rmine

d on

la

rge

scal

e la

yout

s us

ing

the

dim

ensio

ns

spec

ified

in

the

acco

mpa

nyin

g ta

ble

in

the

follo

wing

m

anne

r. m

(2

) He

ad

diam

eter

s fo

r he

ad

sizes

in

dica

ted

are

deriv

ed

from

fo

rmul

as

for

flat

and

oval

coun

ters

unk

head

sc

rews

sh

own

in

Tabl

es

Al-A

5.

Requ

irem

ents

fo

r ne

w he

ad

and

body

co

mbi

natio

ns

shou

ld

be

refe

rred

to

the

subc

omm

ittee

fo

r de

velop

men

t of

pr

oper

di

men

sions

. f

(3)

Valu

es

no

longe

r ta

bula

ted;

fo

rmul

as

are

reta

ined

he

re

for

refe

renc

e pu

rpos

es

only.

iA

I, 8 cc


ASME 818.6.3-1998 NONMANDATORY APPENDIX A

TABLE A14 SLOT WIDTH IN SLOTTED HEAD SCREWS

Tolerance

Screw Size Basic Width Screw Size Plus Minus

O000 thru No formula; see tables O0

O thru Basic slot width = 0.280 D + 0.004 adjusted to O and 1 0.003 0.004 10 standard cutter size 2, 3, 4, and 5 0.003 0.005

6 and 8 0.004 0.005 10 0.005 0.006

12 thru Basic slot width = 0.160 D + 0.024 adjusted to "4 standard cutter size 12 and '/4 0.005 0.006

and 7/,6 0.005 0.008 '/2, 9/16, and 0.006 0.009

'I/, 6 0.005 0.007

3/, 0.007 0.009


TABLE A15 MACHINE SCREW NUTS

Nut Width Across Flats, Size Square and Hex Square Hex Square and Hex

Width Across Corners Thickness,

O thru No formulas; see table Max. G = 1.4142 max. F Max. G = 1.1547 max. F No formulas; see table 12 Min. G = 1.373 min. F Min. G = 1.14 min. F

'14 Basic F = 1.500 D + 0.062 Max. G = 1.4142 max. F Max. G = 1.1547 max. F No formulas; see table

"/8 Max. F: see table thru [Note (1)1 Min. G = 1.373 min. F Min. G = 1.14 min. F

Min. F: see table

GENERAL NOTE: D is the basic diameter of the thread. NOTE: (1) Adjusted to sixteenths of an inch.

98


ASME 818.6.3-1998

NONMANDATORY APPENDIX B

HEX NUTS WRENCH OPENINGS FOR HEX HEAD SCREWS AND SQUARE AND

Dimensions for wrench openings for hex head screws and hex and square machine crew nuts are provided below in Table B I .

TABLE B1 WRENCH OPENINGS FOR HEX HEAD SCREWS AND SQUARE AND HEX NUTS

Nominal Size of Wrench; Allowance Also Basic Between Nominal Product Sizes - (Maximum) Product

Wrench Hex Head Openings

Hex and Width Across Flats and Hex Square Flats of Screw Jaws of Washer Machine Head or Nut Wrench Tolerance Regular Large Head Screw

[Note (111 [Note (211 Min. [Note W 1 Max. Hex Hex Screws Nuts

Screws

~~

0.1250 5/32 O. 1562 3/16 0.1875 7/32 O. 2 187

'/4 0.2500 'Il6 0.3125 11/32 0.3438

0.3750

'/le 0.4375 '/* 0.5000

'43 0.6250 0.5625

~

0.002 0.002 0.002 0.002

0.002 0.003 0.003 0.003

0.003 0.004 0.004 0.004

0.127 O. 158 o. 190 0.220

0.252 0.316 0.347 0.378

0.440 0.504 0.566 0.629

0.005 0.005 0.005 0.005

0.005 0.006 0.006 0.006

0.006 0.006 0.007 0.007

0.132 0.163 0.195 0.225

0.257 0.322 0.353 0.384

0.446 0.510 0.573 0.636

1 & 2

3, 4, & 5

6 & 8 10 & 12

. . .

4

5 8

12 * . .

74 . . . . . .

2 & 3 . . . . . . 0 & 1

4 & 5 2 & 3

6 & 8 4 10 & 12 5 & 6

. . . 8 '/4 10

5/1 6 . . . "8

. . . 3/8

. . . 12 &

NOTES: ( 1 ) Wrenches shall be marked with the nominal size of wrench, which is equal to the basic (maximum) width across flats of

the corresponding screw head or nut. (2) The allowance (minimum clearance) between maximum width across flats of screw head or nut and jaws of wrench equals

(0.005 W + 0.001). The tolerance on wrench opening equals plus (0.005 W + 0.004 from minimurn). W equals the nominal size of the wrench.

99


ASME 818.6.3-1998

NONMANDATORY APPENDIX C DIMENSIONS OF ROUND HEAD SCREWS

Dimensions for slotted round head machine screws and Type I and Type II recessed round head machine screws are provided in Tables CI , C2, and C 3 .

TABLE C l DIMENSIONS OF SLOTTED ROUND HEAD MACHINE SCREWS

Nominal Size or Basic Screw Diameter

Head Diameter Head Height Slot Width Slot Depth A H J T

[Note (111 Max. Min. Max. Min. Max. Min. Max. Min.

O000 0.0210 0.041 0.035 0.022 0.016 0.008 0.004 0.017 0.013 O00 0.0340 0.062 0.056 0.031 0.025 0.012 0.008 0.018 0.012 O0 0.0470 0.089 0.080 0.045 0.036 0.017 0.010 0.026 0.018

O 0.0600 0.113 0.099 0.053 0.043 0.023 0.016 0.039 0.029 1 0.0730 0.138 0.122 0.061 0.051 0.026 0.019 0.044 0.033 2 0.0860 0.162 0.146 0.069 0.059 0.031 0.023 0.048 0.037 3 0.0990 0.187 0.169 0.078 0.067 0.035 0.027 0.053 0.040

4 0.1120 0.211 0.193 0.086 0.075 0.039 0.031 0.058 0.044 5 0.1250 0.236 0.217 0.095 0.083 0.043 0.035 0.063 0.047 6 0.1380 0.260 0.240 0.103 0.091 0.048 0.039 0.068 0.051

8 0.1640 0.309 0.287 0.120 0.107 0.054 0.045 0.077 0.058 10 0.1900 0.359 0.334 0.137 0.123 0.060 0.050 0.087 0.065 12 0.2160 0.408 0.382 0.153 0.139 0.067 0.056 0.096 0.073

0.2500 0.472 0.443 0.175 0.160 0.075 0.064 0.109 0.082 5/16 0.3125 0.590 0.557 0.216 0.198 0.084 0.072 0.132 0.099 ’/B 0.3750 0.708 0.670 0.256 0.237 0.094 0.081 0.155 0.117

7/16 0.4375 0.750 0.707 0.328 0.307 0.094 0.081 0.196 0.148

’/2 0.5000 0.813 0.766 0.355 0.332 0.106 0.091 0.21 1 0.159 ’116 0.5625 0.938 0.887 0.410 0.385 0.118 0.102 0.242 0.183

0.6250 1 .O00 0.944 0.438 0.41 1 0.133 0.116 0.258 0.195 ’/4 0.7500 1.250 1.185 0.547 0.516 O. 149 0.131 0.320 0.242

GENERAL NOTES: (a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Tables 9A, 9B, and 9D. (b) For additional requirements refer to para. 2. NOTE: ( I ) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

101 Previous page


ASME 818.6.3-1998 NONMANDATORY APPENDIX C


TABLE C2 DIMENSIONS OF TYPE I CROSS RECESSED ROUND HEAD MACHINE SCREWS


Diameter

Head Head Recess Recess Recess Recess Diameter Height Diameter Depth Width Penetration

A H M T N. Driver Gaging Depth

[Note (111 Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.

O 0.0600 0.113 0.099 0.053 0.043 0.073 0.060 0.042 0.022 0.014 O 0.035 0.015 1 0.0730 0.138 0.122 0.061 0.051 0.082 0.069 0.052 0.033 0.015 O 0.045 0.026 2 0.0860 0.162 0.146 0.069 0.059 0.100 0.087 0.053 0.034 0.017 1 0.046 0.027 3 0,0990 0.187 0.169 0.078 0.067 0.109 0.096 0.062 0.042 0.018 1 0.055 0.035

4 0.1120 0.211 0.193 0.086 0.075 0.118 0.105 0.072 0.053 0.019 1 0.065 0.046 5 0.1250 0.236 0.217 0.095 0.083 0.154 0.141 0.074 0.046 0.027 2 0.063 0.035 6 0.1380 0.260 0.240 0.103 0.091 0.162 0.149 0.084 0.056 0.027 2 0.073 0.045

~~

8 0.1640 0.309 0.287 0.120 0.107 0.178 0.165 0.101 0.075 0.030 2 0.090 0.064 10 0.1900 0.359 0.334 0.137 0.123 0.195 0.182 0.119 0.093 0.031 2 O. 108 0.082 12 0.2160 0.408 0.382 0.153 0.139 0.249 0.236 0.125 0.099 0.032 3 0.108 0.082

0.2500 0.472 0.443 0.175 0.160 0.268 0.255 0.147 0,121 0.034 3 0.130 0.104 5/16 0.3125 0.590 0.557 0.216 0.198 0.308 0.295 0.187 0.161 0.040 3 0.170 0.144 '4 0.3750 0.708 0.670 0.256 0.237 0.387 0.374 0.228 0.202 0.064 4 0.208 0.182

7/16 0.4375 0.750 0.707 0.328 0.307 0.402 0.389 0.241 0.216 0.066 4 0.221 0.196

'/, 0.5000 0.813 0.766 0.355 0.332 0.416 0.403 0.256 0.231 0.068 4 0.236 0.21 1 0.5625 0.938 0.887 0.410 0.385 0.459 0.436 0.292 0.265 0.075 4 0.272 0.245 0.6250 1.000 0.944 0.438 0.411 0.554 0.531 0.318 0.277 0.077 5 0.285 0.244

"/4 0.7500 1.250 1.185 0.547 0.516 0.654 0.631 0.418 0.379 0.088 5 0.385 0.346

GENERAL NOTES: (a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Tables 9A, 96. and 9D. (b) For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted

102


NONMANDATORY APPENDIX C ASME 618.6.3-1998


TABLE C3 DIMENSIONS OF TYPE II CROSS RECESSED ROUND HEAD MACHINE SCREWS

Nominal Size

Diameter

Head Recess or Basic Screw Diameter Head Height Diameter Recess Depth Width Driver Recess Penetration

Recess

A H M T N. Size Gaging Depth

[Note (111 Max. Min. Max. Min. Max. Min. Max. Min. Min. [Note (211 Max. Min. ~~

O 0.0600 0.113 0.099 0.053 0.043 0.073 0.064 0.036 0.025 0.020 . . . [Note (3)l [Note (3)) 1 0.0730 0.138 0.122 0.061 0.051 0.090 0.079 0.047 0.034 0.022 . . . [Note (311 [Note (3)l 2 0.0860 0.162 0.146 0.069 0.059 0.105 0.095 0.056 0.045 0.025 . . . 0.030 0.020 3 Cj.0990 0.187 0.169 0.078 0.067 0.122 0.110 0.067 0.055 0.027 . . . 0.041 0.030

4 0.1120 0.211 0.193 0.086 0.075 0.137 0.125 0.077 0.064 0.029 . . . 0.051 0.039 5 0,1250 2.236 0.217 0.095 0.083 0.153 0.141 0.086 0.073 0.032 . . . 0.062 0.050 6 0.1380 0.26C 0.240 0.103 0.091 0.169 0.156 0.096 0.083 0.034 . . . 0.072 0.060

8 0.1640 0.309 O.lT7 0.120 0.107 0.201 0.187 0.117 0.103 0.039 . . . 0.093 0.080 10 0.1900 0.359 0.334 0.137 0.123 0.233 0.217 0.133 0.117 0.043 . . . 0.114 0.099 12 0.2160 0.408 0.382 0.153 0.139 0.265 0.248 0.154 0.138 0.048 . . . 0.135 0.120

0.2500 0.472 0.443 0.175 0.160 0.307 0.288 0.181 0.164 0.054 . . . 0.162 0.146 5/16 0.3125 0.590 0.557 0.216 0.198 0.383 0.362 0.223 0.204 0.065 . . . 0.212 0.194

0.3750 0.708 0.670 0.256 0.237 0.460 0.435 0.273 0.251 0.076 . . . 0.262 0.242 '/16 0.4375 0.750 0.707 0.328 6.307 0.487 0.460 0.290 0.268 0.080 . . . 0.279 0.258

0.5000 0.813 0.766 0.355 0.332 0.528 0.498 0.317 0.292 0.086 . . . 0.306 0.282 0.5625 0.938 0.887 0.410 0.385 0.61G 0.577 0.370 0.344 0.098 ... 0.359 0.334 0.6250 1.000 0.944 0.438 0.411 0.650 0.614 0.397 0.368 0.103 . . . 0.386 0.358

3/4 0.7500 1.250 1.185 0.547 0.516 0.650 0.614 0.397 0.368 0.103 . . . 0.386 0.358 - GENERAL NOTES: (a) Use of round head screws i s not recommended; use pan head screws. See para. 1.2.11 arid Tables 9A. 96. and 9D. (b) For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted (2) Point same on all drivers. (3) Not practical to gage.

I03


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ASME B 18.6.3 (1998)

Documents

Transcript of ASME B 18.6.3 (1998)